Top 20 Best Insoles For Standing All Day and Walking All Day (Hiking Boots)

Do you work in a job that requires you to stand all day? A job that requires you to sit only when taking a break or taking a leak? At the end of your shift, have your feet ached too much that you want to go home already and treat them? Maybe you're using the wrong insoles! Wearing the appropriate insoles based on your current situation will definitely alleviate the unwanted agony you're having now. Read along on this article to know the best insoles for standing all day.

Workers working in a restaurant, department stores, assembly lines, doing guard duties are all at risk of developing foot and leg problems later. Because being on their feet is integrated into their job descriptions. Occasional sitting is no problem, but along these types of work, leisure sitting is not that tolerated among their management. Each year, millions of workers lose important days being absent from work because they are suffering from discomfort, fatigue, and pain associated with being on their feet. For instance, as a worker living on every paycheck, you don't want to be away from work if you have to.

What are these problems associated with your feet?

Before going to the focal idea of the article about what are the best insoles for standing all day, we must first know what problems you can get. The most common symptoms that are related to standing for extended periods of time are discomfort, fatigue, and pain in the legs. There are also many other risks attributed to it. Some of them are: developing plantar fasciitis (caused by stress on your plantar fascia), varicose veins, knee problems, restricted blood flow, lower back pain, tendinitis, muscle soreness, bunions, high blood pressure, pregnancy complications, etc.

Other serious problems that would trigger are the worsening of an existing coronary heart disease, and venous insufficiency. Studies showed that pregnant women shouldn't be on their feet for more than three hours at a time. It is especially problematic for a pregnant woman to experience lower limb fatigue because this can cause complications to her offspring by reduced weight and premature delivery.

What causes these problems?

Muscles are designed to support a human being upright. If they are made to maintain a position for a long time, muscles start to ache. Why so? Standing still reduces blood that flows to your muscles and puts a stop to the regular muscle movements that pump back blood from your feet to your heart. If blood can't flow properly, veins at the feet and legs get inflamed causing your muscles to ache. Moreover, when you suffer from pain in an area, your body compensates by reducing pressure on that area and adding more weight on the opposite parts of the feet that can cause spine misalignment plus back pains.

I. Choosing the best insoles for standing all day

Just wearing a good pair of shoes won't ease your discomfort. Because it is relatively difficult to find a pair that has the particular cushioning and support needed for your feet. The best alternative is the shoe inserts. Wearing a pair of high-quality insoles can really add comfort in your every step. Correct your poor posture that resulted from aching feet with insoles. If you're a first timer, insoles are those cushion covers that you put inside of your shoes securing your entire feet. All the stress you've accumulated would be gone, and you'll thank yourself later.

Our list was generated from extensive research done on all the available products in the market. Be rest assured that the top ten best insoles for standing all day are listed here.

1. Superfeet premium insoles

This brand has been in the insole industry for a long time since 1977 and with good reason. Their reason: Because their insoles work for those, who stand all day. A perfect brand for first-time buyers, Superfeet is the perfect orthotic for everyday use and can be used in multiple shoes. You just have to take them out of the shoe you wore yesterday and slip them in the shoes you'll be wearing today. Are you having a problem with getting the right size? Don't worry because Superfeet is trim to fit orthotics, just use the original shoe inserts as a template.

Superfeet takes pride in its design about the deep heel cup that cups your heel to protect it from shock. Also a pain reliever, it is an excellent support for your heel and even your back because of the shape that protects the major pressure points of your foot. It helps form proper bone alignment. This orthotics comes in different colors based on how high your arch is. The present colors are green, orange, and blue. Because it's not thick, this orthotics won't be a nuisance to your shoe because it won't be too tight. This brand is also heavy-duty for the reason that it last ages and doesn't lose its support. Albeit they are on the expensive side of the market, it is guaranteed that you'll be walking and standing pain-free. You'll get what you paid for.

Pros:

• Long lasting
• Anti-microbial
• Anti-fatigue
• Optimal support and stability
• Comfortable
• Suitable for medium to high arches

Cons:

• Not! 🙂

2. Spenco polysorb heavy duty insoles

From the name itself, these are heavy duty insoles. Spenco is one brand among the few that is leading in the insole market industry. They have multiple products for every intended use. They are said to be very comfortable for long time use. Four materials are combined to make up the whole structure of the insoles. For the top layer, we have the green four-way stretch fabric that helps prevent blisters and an anti-microbial feature that keeps the moisture away.

Next is the 5/32 inch Spencore black thing that is said to be anti-shock and very pliable, cushioning your heel. Around the Spencore is the polyurethane, a lightweight foam that provides arch and heel support. The bottommost part is the neoprene, a synthetic rubber that encompasses the whole of your stride. If you're on a budget, you can try your first insoles with Spenco.

Pros:

• Anti-microbial odor
• Washable
• Trim to fit
• Shock absorber
• Durable

Cons:

• Orthotics can be stiff
• Arch area may be high
• Might be too thick depending on your shoes

3. Powerstep comfortlast cushioned insoles

Powerstep offers heel to toe comfort thanks to their advanced technology. From their Amazon page, these insoles have shock absorbing gel that absorbs impact in your every step. The ComfortLast Cushioning Insoles offer controlled cushioning that is soft but maintains maximum support. Their contoured shape gives your heel more comfort to the whole form of your foot with arch support and heel cradle. Their advanced technology called Variable Cushioning Technology (VCT) foam has the ability to conform to an individual's foot over time. Perfect for people on their feet all day.

Pros:

• Decent arch support
• Ultimate cushioning insole
• Comfortable
• Lightweight

Cons:

• Not! 🙂

4. New balance insoles IPR3030 pressure relief insole with met

This brand is for everyday use from standing, running, walking, etc. They are unique because of the metatarsal pad that is designed to reduce friction and prevent from forming blisters. The metatarsal pad also helps reduce discomfort caused by plantar fasciitis, Morton's neuroma, and metatarsalgia. Furthermore, the top cover is of Plazatazote material – that is a lightweight rubber that conforms to your feet for a good fit. It also helps relieve and protect your pressure points, definitely recommended to people diagnosed with diabetes and arthritis.

The design of these insoles is also unique. It has cushioning pods (about Poron cellular urethane technology) that provide maximum shock absorption at the heel and forefoot. Aside from that, the pressure relief arch supports have molded channel to keep moisture at bay, ensuring dry feet. This model has good arch support and heel cradle that help support the foot and reorganize pressure. Like Superfeet, New Balance also has deep heel cup that is the heel's natural padding that adds extra cushion for comfort. They are easy to use. You can trim to fit them with your custom size and insert them to a pair of shoes. But these can be somewhat expensive for people who are on a strict budget.

Pros:

• Anti-moisture
• Anti-fatigue
• Comfortable
• Excellent cushioning

Cons:

• Might be too thick
• Not flat feet-friendly
• For high arches only, e.g. IPR3020 are for normal arches

5. Scholl's massaging gel work insoles

It's no wonder that this brand makes it to our list. Why, because Dr. Scholl's is one of the renowned insole brands that has been on the market for many decades. These insoles are skillfully designed for the workers that are on their all day long and are complaining about their aching feet. Despite being the insoles for the workers, you can also use these inserts in all shoe types for all activities you might have. They are made of rubber that conforms to your feet, and the blue cushions add support and more comfort. These insoles do not squeak, though they are made of rubber.

Also, it has an anti-microbial feature that keeps your feet dry, away from smelling feet. Because of the shock absorption, these insoles can offer, you need not worry about standing all day long with Dr. Scholl!

Pros:

• Reduce risk to energy
• Reduce muscle fatigue
• Doubles the comfort
• Massaging sensation
• Low price starts at $14 in Amazon

Cons:

• Too universal that arches won't match up with some
• Warnings about replacement every six months

6. Dr. Foot’s arch support insoles

If you are looking for a great prevention against foot fatigue, then Dr. Foot’s Insoles might help you with its designed high arch support. Insoles with high arch support have a significant impact on the force your foot receives. Whether you have flat feet, high arch or low arch, this insole adapts to your foot structure. With its flexible and soft foam, you will experience an all-day comfort.

Dr. Foot promises high-quality and medical grade insole through the use of Comfortable Absorbent Velvet Fabric and Durable Polyurethane Material.Dr. Foot asserts its Stoma Design which allows better air circulation. Stoma Design is the reason behind the anti-fatigue advantage. These materials together with its design make the insole act like a spring. As you wear these insoles, your feet will experience the same feeling as it has been massaged. It is undeniably awesome for pain reduction.

This insole is adaptable to your size and on the kind of shoes you have. Prepare your scissors as you may want to cut the insole to your size. Just look at the back of the insole and you will see a clear line referring to different shoe sizes. Dr. Foot ensures friendly customer service. You will get a 30-day money back guarantee if you are not satisfied with the insoles. Plus, you will get 12 months warranty for other issues. After-sales will never be your problem.

Pros:

• High Arch Support
• Stoma Design
• Long Warranty Period
• Economical

Cons:

• Slightly Thick (Offset for Cushioning)

7. HappyStep memory foam insoles

HappyStep ensures its insoles to match your feet through the use of memory foams. This material contains polyurethane and other chemicals which promote viscosity and density. When memory foams have high density, it will mold itself to a warm body. Memory Foams are popular in the pillow and mattress industry due to its comfort advantage. Integrating it with this insole provides enlivening support and cushioning for your feet. The pain won’t be your problem anymore.

This insole features an ultra-light design. So you must not worry for notable additions to the weight of your shoes. Included in its design is a full arch shell to aid your motion and give stability to your shoes. It also follows the stoma design to ensure better air circulation. It is indeed comfortable and adaptable to your feet! HappyStep uses active carbon fibers for this insole. Active carbon significantly absorbs the odor of your shoes. Thus, you don’t need to worry about smelly feet after an all-day use. Regardless of your shoe size, HappyStep Memory Foam Insoles can accommodate you. The foam can be trimmed easily. Just prepare your scissors, cut it to your exact size, and experience the benefits of this insole right away.

Pros:

• Soft Memory Foam
• Ultra-light
• Stoma Design
• Full Arch Shell
• Economical

Cons:

• Sweaty Feet
• Quite Bulky for some shoe types

8. Sof Sole neutral arch insole

9. Timberland PRO anti-fatigue technology insole

Since 1973, Timberland PRO remains a global leader when it comes to design, engineering, and marketing of high-end footwear. They set industrial standards regarding craftsmanship, durability, and protection. Sustainability and environmental campaign inspire the company to use recycled materials for its products. You must never despise recycled materials as it can still stimulate high-quality products such as this Anti-Fatigue Technology Insole produced by Timberland PRO.

The inverted cone design makes this insole unique apart from other marketed insoles. It is anatomically contoured which provides a framework for maximum comfort and support for your feet. This was made possible through their dynamic arch design, making it suitable for all foot shapes.

Quality is assured with this product through the use of leather and synthetic sole. It promotes anti-fatigue technology to help you stand for a long time. It uses the OrthoLite’s polyurethane formula with recycled rubber on its top layer to ensure long-term cushioning, high-level breathability, moisture management, and antimicrobial function. With these features in mind, this insole still remains to be lightweight. Weight addition continues to be unnoticeable.

The performance of this insole remains at optimum even if you wash this along with your regular use. After washing, expect like you have a newly bought insole!

Pros:

• Inverted Cone Design
• Anatomically Contoured
• Dynamic Arch Design
• OrthoLite Top Layer

Cons:

• Very Thick
• Falls Apart Quickly

10. SOLE softec ultra-u arch support insoles

This insole made by SOLE Softec brags with its Seal of Acceptance by American Podiatric Medical Association (APMA). When a product has Seal of Acceptance from APMA, it has been found to promote good health for the feet. With this in mind, you are assured to obtain a quality insole upon purchase.If you have flat feet, bunions, back and knee pain, this insole might help relieve the pain and sores you have right now.

SOLE asserts that this product only uses synthetic materials. It has no animal products or byproducts. That must have relieved you if you are an animal rights advocate.

This insole uses an open-cell cushion measuring 3.2mm layer, branded as Softec. This ensures maximum thickness, especially for loose footwears. Regardless of its thickness, shock absorption is highly promoted with this material. Also, it uses a high-density Ethylene Vinyl Acetate (EVA) foam which has been contoured for integrity and support. Contrary to the weak and flimsy low-density EVA, the higher density EVA makes this insole quite strong, supportive and long-lasting. Additionally, your feet will experience extreme comfort with this insole because the high-density EVA is not hard and shocking to the feet, as opposed to a plastic material.

You have the option to bake the insoles to obtain a custom mold for your feet right away. Instructions are included in the kit.

Pros:

• APMA Approved
• Supports All Arch Types
• Sturdy yet Comfortable
• High Arch

Cons:

• Thick for some footwear
• High Arch might hurt your feet

Partnering your hiking boots with custom insoles like Sole Signature EV Ultra is definitely a good idea. This footbed was used by Ed Viesturs which is the meaning of the acronym, EV.

The EV Ultra is for outdoor people who need extra support for their high-impact activities like hiking. The custom footbeds are heat-moldable to improve one's overall comfort. The heat-moldable variety takes the shape of the foot which is a good idea as not all insoles are perfectly suitable to each unique foot. Furthermore, the shock absorption characteristic of EV Ultra is indeed powerful because it's made of SOLE's SOFTEC. The SOFTEC comes with a 3.2 mm cushioning material that can absorb shocks and vibrations.

Being an outdoor insole, it's highly important that it should offer the support you'll need. Fortunately for EV Ultra, it can do such task as it is made of three distinct layers. The two layers are made of foam which is the high-density EVA at the bottommost layer and the SOFTEC cushioning layer at the middle. They are topped with a perforated polyester top that can manage friction and control moisture.

The EVA layer is a heat-moldable layer that can be heated inthe oven for about two minutes at a temperature of 200°F. It's also equipped with the Opti-Therm Molding indicator that turns black when the insole is ready to be removed from the oven. Before the insoles get cold, place them into the shoes and wear them on. Stand straight in the right posture for about two minutes for the foam to remember the shape of your foot.

Finally, the EV Ultra insoles can support any arch type because they don't use plastic supports.

Pros:

• For high-impact activities
• For all arch types
• Heat-moldable
• Shock absorber
• With wicking properties
• Medium price

Cons:

• Bulky

Another insole good for hiking is the CurrexSole RunPro. It specializes in running but can be applied in many other outdoor activities. It also has variations at the arch area to cater customers that may have flat, natural, or high arches.

The construction of RunPro consists of three layers. The bottommost layer is made out of a combination of both EVA and rubber. They make a good duo to reinforce the shock absorption of the insole. Next to the bottom layer is the memory foam layer at the middle. It has charcoal tidbits which catch odor. The memory foam is proven to last many months without failing. The top layer has moisture wicking properties that prevent the bacteria from settling in. It is made out of soft microfiber.

The arch of the insole has a rigid plastic bridge called as 3D Dynamic Arch Technology or simple 3D DAT. It restricts the foot from overpronation and excessive motions. RunPro also has a deep heel cup but is decoupled to reduce pronation. This part here can absorb impact. What's more, this material is made out of Poron which provides ample cushioning without significant loss in energy return. Indeed, the RunPro can give an extra bounce to your steps.

Pros:

• For different arch types
• Decoupled deep heel cup
• Encourages natural pronation
• Anti-moisture and anti-odor
• Shock absorber

Cons:

• Expensive

Airr Performance is one of your great choices when hiking or any other type of activity.

Airr Performance's top cover is made of CoolMax material that is designed to wick moisture. It is infused with Microban to prevent the growth of odor-causing bacteria. At the middle, the comfort and support are compiled by the polyurethane footbed. Then, the bottommost layer is a combination of three more materials. These are the gel forefoot for cushioning at the forefoot, the nylon plate at the middle part which reinforces proper foot alignment, and the Skydex soft gel at the heel that converts the impact absorbed into kinetic energy to propel you forward.

The CoolMax technology works in a way that allows the moisture taken to quickly evaporate. It also tries to lower the body temperature and to return to homeostasis. On the other hand, the Microban technology can puncture through the cell of an odor-causing bacteria; effectively ceasing growth and reproduction. A cover with Microban is also easier to clean than without.

Airr Performance also features an encapsulated air chamber concentrated in the heel and the arch which functions as a deep heel cup. Not only that but it also lessens the impact. This can be readily felt when you do activities like running.

Furthermore, the overall design of the insole is made slimmer to fit into athletic shoes.

Pros:

• Cheap
• Wicks moisture
• Thin design
• Converts impacts into kinetic energy
• Encapsulated air chamber

Cons:

• Heavy

Powerstep Journey is specifically designed to provide stability and cushioning to rough activities like hiking. It allows you flexibility while retaining and reinforcing the stability of your foot. Moreover, it can greatly reduce the fatigue your feet feel.

This full-length insole offers maximum cushioning and maximum support. It has firmer arch support to protect your arch on uneven surfaces especially if you have flat feet. It can relieve pressure and redistribute the weight throughout the entire foot. Journey Hiker can promote a natural pronation and proper foot alignment.

The insole is made of dual layer cushioning with EVA as the base a shock absorber foam on the middle. The supreme cushioning delivered by the middle layer reduces the stress felt on the feet, ankles, and joints. Journey Hiker is topped with an anti-microbial fabric. It also significantly reduces the heat and friction that may cause blisters.

Journey Hiker is moveable from shoe to shoe just make sure that you buy a pair that really fits you. This insole is also known to accommodate foot conditions ranging from plantar fasciitis, heel spurs, bunions, fallen arches, overpronation, foot cramps, and much more.

The sole design is also very nice. It's available in camo design only.

Pros:

• Maximum support and comfort
• Anti-microbial
• Reduces fatigue
• Shock absorber
• Firm arch support

Cons:

• Expensive

SOLE Active carries SOLE's signature in providing comfort. It can be used in any kind of activity and still function after wear and tear.

This is the type of insole that has the ability to distribute pressure. Due to this, other kinds of foot conditions can be contained or reduced.

There are many materials used to make up SOLE Active. One of which is the heat-moldable EVA layer that can be popped into the oven. After about two minutes, you can then insert the insole into your shoe. By standing upright in the span of two minutes, you are leaving the imprint of your foot into the sole. The next time you wear the insoles, you will feel that they're designed for your feet only.

After the base is the SOFTEC material. It is a 3.2 mm cushioning layer that is powerful in absorbing shocks. This material last a long time and through tests, SOFTEC didn't crack nor brittle. Moreover, SOLE Active's SOFTEC has an open cell construction that draws away the moisture away. Lastly, the top layer has moisture wicking properties and reinforced with Polygiene Odor Control Technology.

This insole has a deep heel cup that can prevent movements of the foot. The arch support is rather high at 3.2 cm so it's good for people who have medium to high arches. SOLE Active has a thick forefoot measuring 5 mm. This is good so that the toes feel more comfortable. And the heel's thickness is measured at 6 mm. The design of the entire insole aims to enhance and promote the natural foot alignment while wearing the insoles under your feet.

Pros:

• Heat-moldable
• Promotes natural foot alignment
• Ample cushioning
• Deep heel cup
• Anti-moisture

Cons:

• Expensive
• Not for flat feet

Powerstep Pinnacle is designed by an experienced podiatrist. Thus, you can ensure that everything about the insole isbeneficial to your foot. Similarly, it is the insole for those who suffer from plantar fasciitis, flat feet, and overpronation.

The first thing you'll notice with Pinnacle is its very deep heel cup. There's also a curve at the middle part which is the arch and offers flexibility to replicate the neutral function through your gait (especially for fallen arches). Pinnacle is also great for providing cushioning to the foot due to the double layering plus the EVA variable cushioning technology that also enhances comfort. The top layer is a fabric that is anti-microbial to keep your foot cool. The fabric material also prevents friction that might cause blisters.

Pinnacle is expected to last about 6 months under normal wear and tear. This may be shorter if you use the same insole every single day. We do recommend that you purchase insoles for every single pair of shoes. Also, replace the insoles when you notice a great difference in comfort and support. More specifically, when you aren’t as comfortable as the first time you’ve worn it.

Pros:

• Medium price
• Anti-moisture
• For foot conditions
• Dual layer cushioning
• Resists friction
• Deep heel cup

Cons:

• Too thick

Standing all day makes the feet exhausted. Also, this act can cause discomfort and pain in the legs. In time, if you wear the wrong insoles, you are vulnerable to conditions like plantar fasciitis, varicose veins, restricted blood flow, muscle soreness, and pain in many groups of muscles.

The Vionic Orthaheel is a great example of an insole that can save your day. Specifically, it will remove the fatigue on your foot with its maximum cushioning while retaining much of the support for your body weight. This specific model specializes in shock absorption with its foam covering from forefoot to the heel.

Vionic Shock Absorber incorporates Orthaheel Technology or also called Tri-Planar Motion Control Technology. In short, this insole can support and promote natural alignment of theentire foot. This technology stabilizes the foot to help eliminate pain by aligning your body from the ground up.

This insole comes with a cushioned arch support that can provide ample support for flat feet or fallen arches. It also has a deep heel cup to prevent excessive movements of the heel.

The top layer nylon features an embedded microbe shield which is EcoFresh earth-friendly. It can readily stop the growth of the odor-causing bacteria. The Vionic Orthaheel is trimmable to fit depending on your desired preference.

Pros:

• Medium price
• Tri-planar motion control
• Promotes natural foot alignment
• Anti-microbial
• Supreme shock absorption
• For many foot conditions

Cons:

• Not for high arches

Superfeet has been featured in hundreds of reviews under the keywords "best insole." Indeed, the Superfeet is a premium brand that is available at a fairly affordable price that can deliver most of the work that most expensive brands already have. For the Superfeet Copper, it aims to deliver you an utmost personal comfort you need on your work.

Superfeet Copper features a unique three-layer foam system which sole application is to provide comfort to its wearer. It starts with a durable bottom layer for maintaining shape and support, a polyurethane foam layer for comfort and stability, and a MemoryCloud memory foam as the top cover which conforms to your foot. It's a pressure sensitive foam featuring a Dynamic Molding Process so there's no need of heating it inside the oven to be moldable.

Furthermore, the top nylon is covered in a nice shade of copper which has a natural coating that can eliminate odor-causing bacteria. The AgION anti-microbial technology of the cover also reduces the friction and hot spots between the foot and insole.

At the bottommost layer under the base foam is a patented stabilizer cup. This aims to provide optimal underfoot support as well as support to the closed cell foam layers. Superfeet Copper is equipped with a deep heel cup to prevent excessive motions and absorb impact.

This insole is applicable to low-impact activities such as for standing and walking for long periods of time. It accommodates all arch types.

Pros:

• All arch types
• Anti-microbial
• Three-layer foam
• Deep heel cup
• Promotes proper alignment

Cons:

• Not for high-impact activities
• Expensive

This the kind of insole you'd want when you're just walking, standing, or running. It also aims to support and stabilize the arch and the heel.

Total Support is made of three layers. Starting at the bottom layer which consists of three materials. These are the First Ray Drop Zone that has the capability of promoting a naturalstride. It can also relieve the pressure at the first met head. It's located in the middle area. Next to the First Ray Drop Zone is what's called the deep heel cup. It significantly reduces the pressure at the heel by cushioning the impact. It also guides the foot preventing it from excessive movements. Below the heel cup is the Spenco's patented 3-POD Modulation System which consists of multi-density impact zones. There are two colors: the red is rigid and counters overpronation while the blue is softer and serves as a guide.

The middle layer of Total Support Original is an EVA footbed that molds to the foot the longer you wear it on. Lastly, the top layer is an anti-microbial that controls odor-causing bacteria. It also resists friction which might have caused blisters.

Pros:

• Cheap
• Anti-odor
• Shock absorber
• Relieves pressure
• Extreme cushioning
• Propels your forward

Cons:

• Runs a little big

ActivePro, from its name, is an insole for sporting activities. With its upgraded attributes to match an athlete's need, this is an insole you can depend to give you comfort for your job that requires you to stand for a long time throughout the day. Wearing insoles in this line of work is important because you don't want to develop certain foot conditions associated to having aching and tiring feet.

ActivePro is made up of three layers which the top cover's color change depending on the arch height. Thus, this is the insole that can accommodate low to high arches. The middle and base layers are fundamentally the same. Below the top cover is a memory foam that is wear-moldable. It can conform to the shape of the foot the longer you wear it. At the base is a blue Poron cushioning.

ActivePro features a 3D Dynamic Arch Technology made of silver nylon composite that supports the arch and prevents it from overpronation and excessive movements. The heel cup is decoupled to give you the flexing as needed. It can absorb impact and convert it into kinetic energy to push you more forward. There's also a Poron met pad that has the same function as the heel cup.

ActivePro is really similar to another CurrexSole insole, the RunnerPro. The only difference between the two is that the ActivePro has more applications compared to the RunnerPro.

Pros:

• For different arch types
• Decoupled heel cup
• Poron metatarsal pad
• Absorbs shock
• Anti-moisture

Cons:

• Expensive