I've been wearing Crocs flats for several years, always buying the same styles over and over again. But when I went to replace the latest pair that I'd worn to death, I couldn't find them anywhere. Time to go back to regular leather/pleather/fabric flats for work :(
In anticipation of buying new shoes, I bought a pair of these silicone heel cushions as well as a pair of the black Official Key Items Heel Cushions. I figured at just $1, it wouldn't be a waste if I didn't end up needing them. But of course, the new shoes were delivered, and while they fit very well, they moved a tad on my heel, which soon became sore. I put these silicone pads in them to stop them from slipping until they were more broken in, which took about 3 days of all-day wear. Unfortunately, I found myself having to put these pads back in place over and over again, as the adhesive quickly gave way and allowed the pads to move all over the place -- at one point they were even under my arches!
Fortunately, my shoes are all broken in now, so I don't really need these grips anymore, but if I did, I think I'd look for a better, probably more expensive option. The price is great here, but the performance is not.