These protective socks are made from pre-oxidized carbon fiber (OPAN), offering inherent non-flammability and self-extinguishing action. LOI ≥45%, resist 600°C continuous heat and 1300°C short-term exposure. Breathable double-knit fabric insulates heat, with reinforced toe/heel for abrasion resistance. Elastic cuffs ensure secure fit. Ideal for firefighting, welding, foundry, and chemical plants. Machine washable; flame performance stable after 50+ cycles. Lightweight, skin-friendly, asbestos-free. Complies with GB 8965.1-2020.