The Petzl Vertex Vent Helmet is a vented helmet for Climbing. Protect your head while headed up on the rock, or even just belaying. While you're doing that, the 6 vents can adjust to your preferences, allowing heat to escape or a cool breeze to enter. Open 'em up when the sun is blazing down and close them when a chilly wind whips along the crag. Features of the Petzl Vertex Vent Helmet Shock absorption achieved through deformation of the outer shell Strong chinstrap (more than 50 daN) limits the risk of losing the helmet during a fall Six-point textile suspension conforms perfectly to the shape of the head CenterFit adjustment system adjusts the headband and keeps the helmet centered on the head Vent holes with sliding shutters allow the ventilation to be adjusted as needed, while wearing the helmet Comes with two sizes of headband foam