When winter delivers two feet of fresh and sub-zero temperatures, stay warm while you get after the goods in the Patagonia Men's Capilene Thermal Weight One-Piece Suit. One-piece construction seals in precious body heat more effectively, and the Polartec Power Grid fabric features a lofted grid pattern that traps more heat without adding weight or bulk. The fabric also wicks sweat and dries quickly to keep out heat-robbing moisture, and it's stretchy for unrestricted mobility. A working fly means you don't have to strip down to take a leak, and the Polygiene treatment inhibits the growth of odor-causing microbes so your stink doesn't seep up into your jacket.