I bought a large, i am 5'9 and 140lbs. They don't give me a wedgy, and I have bigger hips and a round butt, and they still are super comfy. Maybe just a little large, but I would rather large than going up the crack. They are very adjustable too, and the Feet fit SOOO good, fit into a boot perfectly. haven't slipped on any rocks yet either. Pockets in perfect spots too.