I asked around here about these and got much info, and still managed to buy one set that was (a) not the color pictured in the catalog) and (be had a fabric-like surface. Returned them. (I think the brand was Gel-matts or something like then). Then I decided to go for cute and got the ones from W-S that were provencal in print. Had them for a year or so, but the (same thing I feared from the former, the fabric-like top layer separated from the foam interior after a couple of cleanings. So when we had the kitchen walls re-done, and I broke my hip, I just went with I think they're called wellness matts, and bought them as close to the color of my 100 year old floors as possible.
They are not pretty, but I'm here to tell you, if you have one leg longer than the other and like to cook, this is the answer. The result of my surgery is that one leg is 1/2 inch longer than the other (yes, a tall gal to begin with and my friends are teasing me about being yet taller), and this mat really, really helps. My husband loves them as well. Not pretty, but who gives a poop if I can stand upright without listing to the side when I'm doing a long cooking thing. Pay the bucks and take the hit for the good stuff.