Legendary performance style & comfort. The AtmosII utilizes our Thermoformed SL R oll Cage reinforcement a breakthrough in helmet architecture that allows greater ventilation without compromising a helmets integrity. The compact shape offers matchless style & features the sure feel of a Roc Loc ® 5 system that cradles your head comfortably & securely. Its no wonder this helmet continues to be a favorite with road XC & cyclocross riders worldwide. Specifications Weight 265g (CE Medium) Features Featherweight webbing with Slimline buckle Roll Cage Internal Reinforcement Construction In-Mold Polycarbonate Shell with EPS Liner Thermoformed SL Reinforcement Fit System Roc Loc® 5 Ventilation 26 Wind Tunnel Vents with Internal Channeling