Preox-Kevlar fibre (high carbon content (62%) very high limiting oxygen index (LOI > 45%) ensures excellent resistance to flames and high temperatures. The socks have been tested in accordance with the flame retardant requirements of EN ISO 14116:2015 Index 2. ESD approved. Composition: 49% Preox fibre, 17% polyamide, 21% Kevlar, 2% elastane and 1% carbon fibre. Machine washable at 40°C, do not tumble dry.