I got the Capri in these work out style and brand as well. I bought a Large. I wear a US size 10. I do not have big thighs, but these are tight around the thighs and do have a tendency to ride up when you are working out. I noticed "camel toes" at one point when they started really riding up on me! Yikes! Otherwise they are nice because they are above your belly button and smooth out the unwanted bumps. The material is nice and thick! The seams are reinforced and sewn well. There is no cotton liner in the crotch. Great stretch. I just have to pull them down once in a while when I am working out. They feature a pocket too!