Love this product, I am a size 10 and ordered the large and they fit great. The pants are not too small at the waist either that they cut too tight but fit well enough to still stay up during a rigorous workout.

Update: I loved these pants so much and found that I was wearing them so often I needed another pair. However I lost some weight so I decided to try a smaller size which fit very well. Still has a great waistband that doesn't cut into my skin, probably the most comfortable lounge/workout pants I have ever owned. I will definitely be ordering more!