Rothco 1/4 Zip Combat Shirt Polyester/Cotton SLEEVES - 50% NYLON / 50% COTTON CHEST & BACK - 40% ACRYLIC / 60% COTTON 50/50 NYCO RIP-STOP SLEEVES (BLACK COLOR) WITH 60/40 COTTON / ACRYLIC CHEST & BACK (BLACK COLOR) RESISTS MELTING AND DRIPPING MELTING POINT IS RATED TO 230 DEGREES FAHRENHEIT