Petzl Boreo Helmet Durable and extremely versatile. BOREO helmets are suitable for climbing, caving, via Ferrata, canyoning, and more. Hybrid construction helmet with both low profile and headcover Designed to be lightweight and durable, the Petzl Boreo helmet ensures comfort and protection. This helmet is a hybrid construction with a thick ABS shell, EPP foam liner and EPS foam liner that absorbs shock and disperses while remaining lightweight. This construction also works to inhibit sharp objects. The hard outer shell is also shock resistant and scratch resistant for maximum durability. Designed with Petzl standard and enhanced levels of protection with top and side protection Petzls standard level of protection keeps you safe from falling objects from above. Meanwhile, the Petzl reinforcement level of protection protects against the sides, front and rear impact. With top and side protection, you can be confident when climbing, climbing or skiing as it is protected at all times no matter where the impact is hit. In addition, the Boreo features small holes to provide optimal ventilation for both elevation and descent. Air vents allow the helmet to pass through to keep you cool and comfortable on hot and humid days. Soft headband contours to your head for added comfort Folds into a shell for storage and transport. Finally, 4 clips allow you to attach the headlight to your helmet. You wont be caught in the dark. Technical Information S/M - Head circumference: 48-58cm - Weight: 285g M/L - Head circumference: 53-61cm - Weight: 295g