These are SO comfortable! I'm 5'5" and 135 lbs and I got a small and they fit really well. It's freezing at home right now, so these are great for outdoor runs and strength training. I just did a full workout full of jumping, squats, planks, and sit-ups - these leggings stayed in place the whole time and I never felt like the pants would fall down. If you want a great workout legging, these are the ones!