Included these in my first order from Mate. They look snug on the model and I definitely run on the athletic side so I decided to size up to a medium. But I really needn’t have worried! These stretch a lot and then bounce back in the wash. The waistband, however, doesn’t stretch. So if you want your joggers snug in the waist, stay TTS. If you want wiggle room in the waistband, size up. If I had it to do over, I probably would stick with my normal size. I’ll know better for next time, but am still happy with my purchase and getting tons of use out of these joggers already. They’re lovely!