Duofold Long Underwear, Duofold base layer, all purpose polypropylene high performance base layer, men's long underwear keeps you warm and dry at higher activity levels or for just keeping warm. Single layer stretch rib knit fabric base layer. Provides ultimate moisture movement and moderate warmth for cold weather, high activity situations. Features: moisture moving - quick drying, napped for added comfort against skin, static free comfort, wicking waistband for total moisture control, flatlock seams to help avoid irritation. Angle length for most men.