They're excellent for the price. They're soft, yet firm enough for support. In order to get them in the perfect position you must move them several times, causing the adhesive to weaken. I expected that, it's understandable. So When I found the sweet spot, I glued the front and rear edges only, with contact glue or fevicol rubber glue, no problem! Also, everyone' arches are different, it's not possible to have one-height-fits-all. My arches are somewhat high, and these supports are probabl...