Duofold Men's Heavy Weight L/S Crew cotton-blend base-layer-underwear closure 100% Cotton (Inside) And 50% Cotton, 40% Merino Wool, 10% Nylon (Outside) Cold weather, low-impact activities No-scratch, tag-free labels Turn garment inside out. machine wash cold with like colors. use only non-chlorine bleach when needed. tumble dry low. remove promptly. do not iron. India