Ultra-lightweight helmet for climbing, mountaineering, and ski touring Remarkably lightweight for ambitious climbers and mountaineers. The Sirocco® helmet was designed to give you an exceptional weight-to-protection ratio (170 g). Lower in the back, the design provides greater coverage and offers enhanced protection over the entire head. Its low profile and superior ventilation give you all-day comfort. The hybrid construction decreases weight (170 g) and provides all-day comfort. Open front profile makes the helmet rim invisible to the user and offers an unobstructed field of view. In addition to ventilation holes, the interior foam and liner feature integrated air channels for better air circulation Petzl - Sirocco\u00ae Climbing Helmet white