Your go-to for classic base layer, Micro-Elite Chamois is synonymous with the Hot Chillys brand. The descendant of the first technical base layer created in 1984, ME Chamois has developed a reputation for being the most reliable, durable base layer made by our company. The secret to the success of Hot Chillys long underwear for women lies in the fabrics intimate blend of enhanced polyester and spandex fibers. These long womens thermal underwear bottoms are a highly technical, high-performing piece of thermal underwear thatll keep you warm for years to come.