Superb support. Not only do they reduce ankle, knee, and hip problems while exercising; they also improve my balance considerably by stabilizing my feet. For me they are as good as my prescription moulded orthotics and they fit in shoes better! I showed them to my physical therapist and now he wears them too. i have not found any others that are designed for a dramatically high arch. Most nonprescription insoles are useless if you have high arches. Almost none of them are contoured enough to even touch your arch, so they might as well not be there at all; or if they are contoured enough, they are so soft that they squish down with the slightest pressure. (They might be supportive if you weighed thirty pounds, but how many toddlers need arch supports?) IsoArch is firm without being hard or stiff. It is deeply contoured. It is not narrow in the heel but it is flexible enough that it doesn't spread the heels of my shoes too much. My hard prescription orthotics seriously distort the shape of my shoes and cause the heels to slip. The drawback of the relatively soft IsoArch material is, of course, wearing out. I advise getting several pair to wear in different shoes. As soon as you notice they are getting tromped down, throw them out. 20 or 23 dollars may seem like a lot for something that lasts only a year; but I believe that, if your footwear and insoles aren't doing you any good, they are probably doing you harm. If you keep your feet healthy with good quality shoes and good nonprescription insoles, you might save yourself the really harsh expenses of podiatrist visits and prescription orthotics (200 to 350 dollars a pair!)