Great material. They are sort of silky on the inside so they go right up onto my body and don't make me sweat. And they really look like jeans. Like well fitting skintight jeans, which is sexy. I have quite a booty but I definitely will be buying mediums from now on instead of large, although if you want a relaxed fit that looks nice too, just have to wear a belt. I would say they are much stretchier than you think so you could size down if you weren't sure. I weigh 165lbs, 5 5 tall and I have a big booty and smaller waist and big ol thighs, if that helps you at all.