Dynamic™ Stromboli™ Hardhat with Cap-Lock BladesSafety helmet designed primarily for welders and high heat applications Shell is made of lightweight polycarbonate offering exceptional protection against heat, radiation and impacts The rain trough free shell is narrower than other models and allows the addition of all types of welding helmets available on the market without any restrictions Attachment points for chin straps "Sure Lock" ratchet adjustment to properly fit all head sizes large or small