I'm 5'11 153 lb with a 31 waist I purchased the medium and they fit well they are light have decent pockets I could wear them over compression tights for running and cooler weather or in the summer with a lighter brief. Oh yeah I got them in size medium. If I see these again on sale let's say 20% off the OG price I would purchase them because there are not too many shorts that I feel can be a shoulder season running short that would go over a compression tight and be comfortable and not chafe.