Let's face it. Nether regions get pretty heated! So ditch the bunched, sweaty cotton undies and pull on the revolutionary cooling technology of Armachillo® Boyshort Underwear. Microscopic jade embedded in the fabric feels cooler on skin while the 4.9-oz. 91% nylon/9% spandex knit fabric pulls moisture away to nix chafing. Special fabric treatment fights odor, too. Lightweight yet stretchy, they stay put and support as you're climbing or crouching. Chafe-free, stretchy flat-lock stitching plays down panty lines, and there's a double-layer crotch for comfort.