BLACK 37% Polyester, 28% Cotton, 16% Rayon, 10% Olefin, 1% Rubber, 8% Other fibers. GREY 58% Polyester, 21% Cotton, 9% Olefin, 7% Rayon, 1% Rubber, 4% Other fibers. NAVY 56% Polyester, 19% Cotton, 9% Olefin, 9% Rayon, 1% Rubber, 6% Other fibers. Multi-use, wicks moisture and dries quickly. Do not bleach. Tumble dry low.