These are the most comfortable sweat pants I've ever owned. I go running in them and don't feel stupid for wearing sweat pants outside. But if the temperature is above 70 degrees you might actually start sweating a little. Definitely made for the fall and winter. I got a size small because I wear a size 30 pants, and they fit perfectly. The length of them keeps them from riding up my leg easy, exposing my ankles to cold weather (I wear low-cut socks even in the winter and I'm about 5'9). Nice to have them cover my entire leg. They barely go under my foot when I'm standing.