Ordered 3 sizes of these pads to replace the thin foam pads everyone sells. They arrived sooner than expected, & each came in a reuseable zippered storage bag. About 3/8" thick, with a non-slip surface on one side & felt on the other. I need the non-slip now, but will be moving in the near future & like that if I have carpet, I can put the felt side down & still use my rugs on top of the carpet without worry.  Oh, and the prices on sale were less than I paid for the cheap foam pads these replace!