These are my all time favorite underwear. They fit like a Large should - I wear a 36 jean. They feel weightless and never get swampy or smell bad. They do not ride up in the legs like some of the other david archy boxer briefs do. I don't really care if I have a fly or not but most guys do and its worth the extra money to get these over the non-fly ones. I recommend these to every one of my friends. I like these more than some of the more expensive ones I own from SAXX or Mack Weldon or MyPakage. Best buy on the market.