Woolpower Helmet Cap Protection 400The Protection 400 Helmet Cap is made from Woolpower’s Protection 400 fabric combining merino wool with aramide, beltron and elastane to provide Flame Resistance, Antistatic and Electric Arc protection.Woolpower Protection 400 has an extremely high ATPV value of 34.3 cal/cm².This snug fitting Helmet Cap liner covers the head and neck and is designed to make head protection fit wellPROTECTION 400:84% Merino Wool14% Aramide1% Beltron1% Elastane