Love these! The material is quite thick and not see-through at all, yet they are VERY stretchy and form-fitting! I bought them with the intention of using them as warm underwear only, but because of the quality of the material I've had no problem wearing them as casual pants on warmer days. I have big legs and a small waist, and oftentimes leggings are too loose in the waist and tend to slide down as I exercise; these stay put! I'm ordering more of these.