The Hot Chillys Men's Micro-Elite Chamois Zone Zip T-Neck is your go-to for a classic midweight base layer. Micro-Elite Chamois is the descendant of the first Technical under layer created in 1984. This fabric has developed a reputation for being the most reliable, durable long underwear made by Hot Chillys. The secret to this thermal underlayer's success lies in the fabric's intimate blend of enhanced polyester and spandex fibers. The Hot Chillys Men's Micro-Elite Chamois Zone Zip T-Neck will keep you warm for years to come. | Hot Chillys Men's Micro Elite Chamois Zone Zip T Neck