“Great fabric with a perfect fit! I need to have unders stay in place UNDER my buttocks cheeks or else I will constantly feel them moving. That is why I like these. I have discovered I like the size small in there better than the medium so they can be just a bit more snug on my legs. I wear unisex small and womens 8. I am 5'7" 140 and my hips are about a 41.”