Details Petzl Boreo Helmet Durable and extremely versatile, Petzl's Boreo helmet is suitable for climbing, mountaineering, caving, via ferrata, canyoning... you get the idea. Thanks to a hybrid construction, the helmet is both compact and head-covering. Protection against lateral, front and rear impact is reinforced, while optimized volume and wide ventilation holes make it a comfortable helmet for all activities. Weight: 285g (S/M) 295g (M/L) Head circumference: 48-58cm (S/M) 53-61cm (M/L) Hard outer shell is impact and scratch resistant for optimal durability Hybrid construction with thick ABS shell, an EPP foam liner and an EPS foam liner makes it compact on the head  Soft headband conforms perfectly to the shape of the head and folds into the shell for storage and transportation  Head-covering for optimal protection against lateral, front and rear impact Carries Petzl's TOP AND SIDE PROTECTION product label  Head-covering shape, lower in the rear, offers reinforced protection Four clips for headlamp attachment  Compatible with the VIZION eye shield 3 year guarantee  Material(s): ABS shell, expanded polypropylene (EPP) liner, expanded polystyrene (EPS) liner, polyester webbing Certification(s): CE EN 12492, UIAA Specifications Boreo Helmet