This is the classic Petzl Ecrin Roc helmet, the standard for mountaineering, climbing and caving. Extremely durable, this helmet can withstand the harsh conditions and rough treatment that are often encountered in the high mountains or deep caves. Features: Thick injection molded polycarbonate shell for protection and durability. Easy-to-use adjustment wheels dial in headband and nape strap size for an extremely comfortable fit, even while the helmet is being worn. Chin strap position adjusts forward or backward. Well ventilated with 14 holes. Secure headlamp attachment with 4 optimally placed clips. 2 thicknesses of foam bands included for customized fit. Specs: Weight: 445 g (15.7 oz) Colors: Red, White, Yellow One size: 53 - 63 cm CE / UIAA Materials: Injection molded polycarbonate shell Polyester webbing straps American Alpine Institute Guideschoice