Giro atmos ii helmetlegendary performance style and 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 and features the sure feel of a roc loc 5 system that cradles your head comfortably and securely its no wonder this helmet continues to be a favorite with road xc and cyclocross riders worldwide features feathe