I got these to help with circulation in my legs and received the added bonus of looking thinner and getting a butt lift. (I was unaware of that feature and was pleasantly surprised with the results.) I wear them under leggings and pants, because they look like shapewear to me, and because I want to protect them from snagging. For reference, I'm 5' 4" and 115 lbs and the smalls fit as described.