The Petzl Meteor's innovative adjustment system lets each climber to adjust his or her helmet to their head shape for a customized fit. Large openings provide excellent ventilation, and a magnetic buckle allows the chinstrap to be attached with one hand. Soft headband conforms to the shape of the head. Excellent ventilation. Comfortable and breathable foam lining is positioned to stabilize the helmet on the head. One-handed chin strap attachment.