Our Thermal Bodysuit is simply the warmest base-layer, thermal available... at any price. Like all of our apparel, the Thermal Bodysuit was originally designed at the request of NFL football players. Perhaps the best way to describe our Thermal Bodysuit is to quote Scott Koopman, Big Sky Conference Football Official from November 6, 2003: "I had the opportunity to use my new bodysuit this past weekend for the first time. It exceeded my expectations!! At game time the temperature was twelve degrees with a 15 mph wind. As the afternoon progressed I was really impressed with how moisture wicked away. I never felt like there was much variation in the warmth provided. When exerting I didn't feel clammy or overheated, but at the same time, while standing waiting for TV timeouts, was nice and warm. Great product." This is a full thermal bodysuit with a stirrup style. The colors available are Black, Navy, Red or Royal in sizes X-Small, Small, Meduim, Large, X-Large and XX-Large.