Unventilated shell protects against electrical hazards and moltenmetal splash. Six-point textile suspension ensures maximum comfort, and its CenterFitadjustment system adjusts the headband and keeps the helmet centered on the head. VERTEX BEST is designed for optimal attachment of a PIXA or ULTRA VARIO headlamp, a VIZIRor VIZEN protective shield, and hearing protection. EN397; EN12492; EN50365; ANSI Z89.1-2009 Type 1 Class E