Technically" comfortable is the best way to describe the Terramar microcool Boxer briefs. Microcool is a uniquely engineered fabric cooling system utilizing a combination of yarn-based technologies to maximize comfort. The unique flat yarn in this Boxer brief greatly increases the surface area to help draw heat away from the skin. The yarn is embedded with nano-mineral particles to enhance heat absorption away from your body. The yarn is also designed with channels that transport moisture to the outer layer resulting in an immediate cooling sensation and lowering of the skin temperature.