I purchased this hoping it would be a better option than the panty style slimmers, which constantly roll down and I was not disappointed!  This slimmer is made of a soft, comfortable fabric that isn't too hot and wears well under clothes.  It slims from the hips all the way up the back and bra line, doesn't ride-up or roll on the bottom, and is very comfortable for all day wear.  The slimming effect is moderate - not a firm control briefer in my opinion, but slims, smooths, and firms nicely without being restrictive.  Every bit as good as the more expensive versions.  I'm ordering a few more!