These tights look really good, but they don't offer much compression for me (and I have very muscular, sort of big legs) except in the waist. I am 36-29-37 and went with the medium. I had to clip the elastic in several places in the waist so that they would not be so uncomfortable. They're fine now, but cutting the waist was not something I wanted to do to something this expensive. They should have made these with a wide waist band, like Louis Garneau shorts/tights have. Also, the material is extremely thin.