Unvented helmet shell for safe use with electrical applications. Electrical insulation up to 1000Vac or 1500Vdc (EN 50365). 6-point textile suspension harness. Size adjustable headband via wheel ratchet system. Chin strap ncluded. Compatible with PW47 and PS47 clip-on ear muff. Electrical properties (440Vac). Up to 7 years lifetime from manufacturing date CE-CAT III