Petzl Meteor Climbing Helmet Black/Gray S/M. This model has the advantage of large openings for excellent ventilation. Its innovative adjustment system allows each climber to adjust his/her helmet to head shape. The Meteor also comes with a new magnetic buckle which allows the chinstrap to be attached with one hand. Specifications for Petzl Meteor Climbing Helmet: Manufacturer: Petzl Gender: Unisex Fabric/Material: Expanded Polystyrene Liner PC Shell Weight: 7.76 oz Features of Petzl Meteor Climbing Helmet: Comfortable to wear in all situations Lightweight and comfortable on the head Excellent ventilation Soft headband conforms perfectly to the shape of the head Magnetic buckle allows the chinstrap to be attached with one hand (Petzl patent) Integrated chinstrap attachment points to reduce thickness Comfortable breathable foam lining is positioned to stabilize the helmet on the head Chinstrap buckle and headband height are adjustable for a perfect fit Headband folds into the shell for storage and transportation Adapts easily to the activity Headlamp can be attached using the four integrated clips Compatible with the Vizion eye shield For climbing and mountaineering Size 1: 18.9-22.05 in / 48-56 cm Size 2: 20.87-24.02 in / 53-61 cm Package Contents: Petzl Meteor Climbing Helmet Petzl A071AC04: Meteor Climbing Helmet Black/Gray S/M