92% Polyester, 8% Spandex Pull On closure Machine Wash Thermal underwear for men is made of 92% Polyester and 8% Spandex, luxurious and snug, but it doesn't restrict movement at all. The base layer men's set matches neatly and when temperatures are close to or are freezing cold, they keep you quite warm. Wear-resistant and shrink resistant material. Offers full mobility and freedom of movement, gives you flexibility to move and keep you warm without sacrificing your range of motion or comfort. The long underwear mens can be worn as comfy pajamas on chilly nights. Thermals top and bottom set for men are designed to be thin but effective at insulating body heat. The lightweight material is not just able to retain body heat but simultaneously wick away moisture to maintain a comfortable temperature. Our long johns for men are snug designed, that ensures no bunching around your waistline or sleeves to reduce heat loss and better fit when worn under outer layers. Machine Washable, repeatedly washed without shrinking, no fading with the highest grade color fastness, non-irritating. Please DO NOT put them in dryer.