Lightweight, tough polycarbonate shell protects you from falling rocks, ice and debris. A unique adjustment system lets you fit the head and nape straps with the helmet on; includes two interchangeable foam headbands for custom fit. Polyester webbing chinstrap has a softer feel for more comfort; can be adjusted with the helmet on or off. Meets all UIAA specifications for shock and energy absorption, conical impact, security of retention straps and ventilation standards. Unique integral hooks hold headlamp straps for better security. Amply vented sides for good airflow.