Durable and very versatile, the Petzl Boreo helmet is suitable for climbing, mountaineering, caving, via ferrata, canyoning and more. Thanks to its hybrid construction, it's head-covering but very compact, with reinforced protection against lateral, front and rear impact. Optimised volume on the head and wide ventilation holes make it comfortable for all activities.Impact/scratch resistant hard outer shell for optimal durability Hybrid construction with thick ABS shell, EPP foam liner and EPS foam liner Compact on the head (carries Petzl's TOP AND SIDE PROTECTION product label) Head-covering shape, lower in the rear, offers reinforced protection Soft headband conforms perfectly to head shape, and folds into the shell for storage and transport Four clips for headlamp attachment Compatible with the Petzl VIZION eye shield3 year guaranteeSize:_Head circumference: 48cm - 58cm (Small) 53-61cm (Medium)Weight: 285g (Small) 295g (Medium)Material(s): ABS shell, expanded polypropylene (EPP) liner, expanded polystyrene (EPS) liner, polyester webbing _ Certification(s): CE EN 12492, UIAA