For professional use in challenging environments, we have manufactured Helmet Cap Protection 400. It is certified according to special EN standards for flame retardant, anti-static and arc protection. For maximum protection, we recommend that you use a complete base with other certified outer garments. Helmet Cap Protection 400 is tight and covers both head and neck under your helmet. While keeping you warm, the unique properties of the wool release excess heat. Specifications Merino wool 84% Aramid 14% Beltron 1% Elastane 1%