Put warmth into high gear. X-Temp3; technology is designed to adapt to your temperature and activity to keep you cool and dry for all day comfort. Soft, waffle knit thermal organic cotton blend fabric gives you comfortable warmth. Made with a portion of Earth-friendly recycled polyester. Sturdy seam construction for added strength and durability with smooth, flat no rub seams to prevent chafing. Preshrunk for lasting fit. Size up for a roomier fit. Tag-free for itch-free comfort.