Two-Layer engineering Traps air between layers providing a natural barrier of warmth More Merino wool for extra warmth Inside Layer: 100% combed ring spun cotton Outside Layer: 50% combed ring spun cotton, 40% MERINO WOOL, 10% Nylon Fabric weight: 8 oz. Comfort waistband Rib cuffs, gussets, front and back rise for added protection against cold Full cut ? true fit Soft cotton next to skin