BALAEF Men's 3 Inches Boxer Briefs Sports Trunk Underwear Cool Dry with Fly (2 Pack) is manufactured by 90% polyester 10% spandex stretch fabric, it's fitted to your skin without any squeeze. The quick-dry material wicks sweat away and dries really fast, and the mesh pouch in the crotch area offers a better breathability. Convenient open fly design makes it easier when you are in a suit or uniform. Non-chafing system - tagless design, no riding-up smooth stitches.