I actually ordered these to wear on cold days instead of long nderwear bottoms. These fit me great, not too tight in the waist, which I hate, but cling nicely, though I haven't done any extremely active workouts in them yet. They are not 'slick' on the outside like nylon, so they are not perfect for under my slacks, but they seem to work well enough, verbally ver comfortable fit, I'm 5'5" and 135 with relatively thin legs...don't say stick :-)