These arch supports are the best I've ever used and I am middle aged and have had custom orthotics made by a variety of sources ever since I was a kid. Flat, highly flexible feet and therefore over-pronation are a family trait so the kids that inherited this, got arch supports as we were developing in an effort to minimize the consequences.

I noticed one of the top-rated reviews complained about the fabric covering; I don't think her experience is common. I have these insoles in all of my footwear, slippers, tennis shoes, river rafting shoes, hiking boots snow boots, etc. and have had zero issues with with friction wearing out my expensive wool socks either ultra lightweight or heavy expedition weight. Neither have I had any friction or heat issues against my bare feet in my tennis shoe style river rafting shoes, even after a 3 day rafting trip. Since the flat feet is a family trait and I have a large family, I've recommended them to many family members and all of them really like them, too.

Another negative review mentioned that the heel is too wide for women's tennis shoes. My feet are narrow, an A width, so I usually wear Nikes tennis shoes as they tend to run narrow and I don't have any problems fitting these into my shoes.

My husband has a totally different kind of feet, originally high arches, that have fallen, moderately flexible, with significant metatarsal damage from dropping a 70 lb. tractor weight on his foot 35 years ago. He's a construction surveyor in Montana and Wyoming and hiking 15 miles a day over very rough, mountainous terrain is very common for him. These are the best arch supports for him as well, in fact far better than the custom made supports the podiatrist talked him into buying years ago. Correct fit is definitely important though and to get the medial longitudinal arch (the long arch on the inside of your foot) in the right position he has to buy a size 13 arch support and trim it down for his size 10 1/2 foot. He has sensitive skin, clothing tags and laundry detergent frequently cause discomfort, but he doesn't have any issues with the fabric covering of the Icebugs either. And his merino socks don't wear out unreasonably quickly either.

I read a review if insoles for cycling and this thin insole was the best fit for me. Specialized brand we're also recommended in the article. I've purchased both, neither is inexpensive. The Icebug has better arch support (my arch is HIGH) and raised spots to unload forefoot stress. Came quickly, good documentation, easy to fit or trim, and they work very well. Highly recommend.

I added these to a pair of Giro Empire XC90 mtb cycling shoes. Size 45.5 I've been dealing with Metatarsal nerve impingement while riding.
It goes something like: at mile 10 the first hints of "heat" start to be apparent at the balls of my feet, especially the outside of the forefoot. then by mile 20, numbness of my 3rd, 4th and 5th toes starts to set in. By mile 30, mild pain in the outside of my feet near the ball of the feet, by mile 40 the pain becomes somewhat annoying, by mile 50... I have to consciously think about something else, and try my best to ignore it. By mile 60... it becomes unignorable and starts to degrade my pace. By mile 70, the pain is debilitating and I have to either stop, take my shoes off and let them rest for about an hour, or finish the ride.

These seem to have fixed that for me. So far I've done a 12mile (maximum effort sprint pace) a 17mile (again max effort with some steep hill climbs) and a 30 mile (max effort with more climbing) rides.
On the 12 mile ride - no hint of the heat (and by extrapolation, the other symptoms that would follow it)
On the 17 mile ride - no symptoms, no hints of impending numbness.
On the 30 mile ride - no symptoms. No heat, no numbness, no impending pain.
All three rides left my feet feeling as if I had just been walking around in a good pair of supportive hiking boots for a few hours. Ie: normal. Usually my first priority after a ride is to doff my SPD shoes... like ASAP. Not now, on return it's no longer a "OMG get my feet the @#$% outa these @#$%ing shoes" kinda deal for me.
I'm very confident that these insoles may have licked my problem. Time, and a couple of 60 mile + rides will tell for sure, but right now. They are worth a shot if you have similar problems as I have on the bike with your feet. That metatarsal button is the real deal. It might feel funny at first, kinda alien, not uncomfortable... just really weird. Ignore it. Think about something else. Your body will adapt to them. And you'll be happy it does. I'm 100% convinced It's the key to pain free riding if you get nerve impingement at the metatarsal heads.

EDIT: update, completed a 70 mile ride today, 17mph average speed, 3100 feet of climbing. Really putting the spurs to it for me.
Finished ride with ABSOLUTELY ZERO PAIN, NUMBNESS, OR DISCOMFORT in my feet. Legs were kinda tired, back a little sore, hands a little numb... the twig n' berries a little numb.... feet? Absolutely symptom free. Ice bug is the real deal, as far as I'm concerned. If I could, I'd give this product 6 stars.

I had to trim mine, since my Giros are narrow at the forefoot, and I bought the size 12 insole, and trimmed to 11.5 (which is about what a 45.5 comes out to) I accomplished this by lining up the heel cups and tracing the OEM insoles (which are actually pretty decent... with removable and adjustable arch supports... just no metatarsal button) with a sharpie onto the ice bugs.
I then carefully trimmed them to match the tracing with a fresh exacto knife, and inserted them into the shoe footbed.
Easy peasy.

Again, these may not be for everybody - but if you experience the symptoms of metatarsal nerve impingement when riding... they may be your best purchase all year.

These work relatively well for bike shoes, better than the insoles that come with the bike shoes. They don't give you much of any cushioning in bike shoes as they would with a pair of tennis shoes, about as hard as the insoles that came with the bike shoes(bike shoes have a hard base, so the only cushioning you get is in the insole.), if you have "hot spot" issues with the piar of bike shoes, it maybe better to get a pair of the fat version insoles, if you have enough space in the shoe for them, these slim insoles won't get rid of that. The arch in these are a little bit more flexible than I had expected, compared to other arched insoles.

For insole fit in a bike shoe, bike shoes tend to run 1-3 sizes smaller over tennis shoes, so you may have to trim them to fit. My pair of shoes are a size 13, I got a size 12 insole, and the fit in the shoe is about as tight as you can get it without the insole bunching up in the shoe. For regular shoes I wear a size 11.5 to 12 for most pairs of shoes(in extra wide, 4e width.). My bike shoes probably run at around a standard wide width(2e) for the brand of shoe, which is a "tad" narrow.

I use these in cycling sandals and other water-tolerant bike shoes with flat pedals while navigating my prop drive/pedaled catamaran on long 30-40 mile day trips on the ocean. My feet have become intolerant of narrow shoes, and I have developed some forefoot neuropathy after decades of cycling. These tolerate frequent drenching without the adhesives separating, are thin enough to take minimal space inside a shoe, have the metatarsal bump, and a decent heel cup for stability. They work. Not as padded as thicker insoles, but I need maximum toe box space inside my shoes. I'd run the thicker version if I could, but most cycling purpose shoes that can tolerate immersion run a bit narrow, so I need something thin.