CYZ Men's Long Sleeve Mid Weight Waffle Thermal Crew Top or Long John Set These long sleeve undershirts are made of 60% Cotton/40% Polyester luxurious cotton waffle fabric, constructed to retain heat. Soft, waffle knit thermal cotton-rich fabric gives you comfortable warmth. Tag-free for itch-free comfort. Shrinkage controlled for lasting size and shape retention. Sturdy seam construction for added strength and durability with smooth, flat no rub seams to prevent chafing. Comfortable rib knit cuffs stretch to keep their shape.