I bought 3 rugs in 2 different sizes. The smaller (2x3) is frustrating because the edges/corners turn up. Ive unsuccessfully tried taping them down. It causes a  potentially dangerous tripping hazzard. The other 2 rugs (2 1/2x4) arent nearly as bad, but they dont lay flat either. Ive been using them for about 6 months, hoping they would relax as time passed, but that hasnt happened.