Petzl’s Vertex Best work/rescue helmet in Husqvarna orange. Polycarbonate shell with sidle slots for hearing protection and face shield. Four-point harness systems with a thick foam replaceable headband. Headband adjusts from 20.8" to 24.8" with a simple headband adjustment wheel. Chin strap is designed to decrease the risk of losing the helmet in case of impact (breaking strength of more than 50 daN, NE 12492 mountaineering helmet standard) and can be adjusted forward or backward. Meets ANSI Z89.1-2003 Type 1 Class E.