Petzl VERTEX VENT ANSI helmet Black A10VNA with a FREE drawstring storage bag Six-point webbing suspension system conforms to the shape of the head for improved comfort. Shock absorption achieved through deformation of the outer shell. CenterFit adjustment system ensures centering and optimal stability of the helmet on the head Side slots for mounting hearing protection. Inserts for accepting a VIZIR face shield. Slot for mounting PIXA headlamp. Ventilation holes with sliding shutters allow the ventilation to be adjusted as needed from the outside