I'm 5'6", 122 pounds, and purchased the medium. They fit me pretty much exactly how they fit the model. Not too tight around the waist, booty, or legs. They are a little bit of a thicker knit fabric than I was expecting. They are slightly too warm to wear in the summer in Texas to exercise or walk my dog, which is kind of why I purchased them. But they will be nice in the Spring or Fall. I will probably purchase another pair!