The Boreo is an incredibly versatile helmet with ample coverage and reliable protection, suitable for a wide range of mountain pursuits from climbing to caving. The hybrid construction combines a thick, durable ABS shell with EPP and EPS foam liners to give maximum protection with minimal bulk on the head. The wide ventilation and optimized head fit mean that you will be comfortable and cool as well as protected, wherever you are on the mountain. Petzl Boreo Climbing Helmet | Ultimate Outdoors