5'8" 160lbs and I bought a med. Very nice material and waist band. Comfortable with a somewhat high rise. Not a fashion brief. More of an old guy cut. Like these a lot. They have been through a few wash cycles and still look new. Jury is still out on how they will hold up long term. I used to buy Stanfields briefs when I traveled to Canada, and these are every bit as good as the Stanfields.