Two-layer engineering Traps air between layers providing a natural barrier of warmth Inside Layer: 100% combed ring spun cotton Outside Layer: 65% combed ring spun cotton, 25% MERINO WOOL, 10% Nylon Fabric weight: 6.6 oz. Tagless design and flat seams provide smooth fit and extra comfort Rib cuffs and drop tail for added protection against cold Full cut – true fit Soft cotton next to skin