The Sugoi MidZero Wind Boxers are a thermal protective under layer that allow for maximum performance and comfort.Features:A full stretch moisture wicking mid-weight base layer with a fleece inner for amazing comfort Firewall 180 fabric on front panel for wind and water protection Flat seams for increased comfort 1 1/4 signature moisture wicking comfort elastic waistbandSpecifications:Defined Color: Black Color: Black Gender/Age: Mens Size: X-Large Material: Synthetic Windblock: Yes Thermal Rating: 3