These are SO comfortable! These fit as expected for tight workout pants. I always buy larges in workout bottoms and medium/large in tops. usually larges becuase I hate my clothes too tight. Anyway. These leggins are SO comfy. I love that the waistband comes up high and provides a little bit of a smoothing shaping effect. they do not slide down on me and I have quite a bubble butt and curvy hips. I am usually a size 8/10 and I get larges in all my workout bottoms. I don't know why some people were saying the fabric isn't breathable because i thought it was very breathable and I didn't feel like I was sweating to death in them. I want to buy more of these.