When it's Texas-hot out there on the job site you need the absolute best cooling performance everywhere you can get it. So ditch the hot, sweaty cotton undies and pull on the revolutionary cooling of Armachillo® technology. Microscopic jade embedded in the fabric feels cooler on skin while the 63% polyester/29% nylon/8% spandex knit fabric pulls moisture off your skin to nix chafing, fabric treatment resists odors too. Lightweight yet stretchy, they support as you're climbing, crouching, reaching and the smooth flat-lock stitching on the seams mean no lumps and bumps pinching your skin all day. No wimpy waistband either – ours is 1-1⁄2" wide and brushed for pinch-free comfort. Snug fit for greater support. So don't steam your oysters, put em on ice with Armachillo!