Men’s Heat Holders Performance Base Layer Long Johns designed to keep you warm in cold weather. These thermal long johns are ideal for trapping warm air close to the skin, providing an effective thermal base layer for colder days. They feature an easy-fit design for a smooth, slim profile under clothing and an elasticated waistband for comfort. The technical construction and supportive fit contour to your body's natural shape, making them barely noticeable under your clothes. Heat Holders thermal underwear also offers moisture and odour management, keeping you warm, dry, and fresh all day. Available in Original (thickest), Lite (medium), and Ultra Lite (lightest) thicknesses, allowing you to choose the right warmth level based on activity and temperature. Composition: 100% Polyester. Machine washable at 30°C.