Giro Synthe Road Bicycle Helmet. The Giro Synthe represents the pinnacle of road Bicycle Helmet design. It offers impressive cooling power, minimal weight, supreme fit, and streamlined aerodynamic efficiency. It is a true synthesis of all the features a rider demands in a high performance road Bicycle Helmet. Suitable for all conditions, all the time, the Synthe rivals standard road helmets with its exceptional ventilation, low weight, and good looks. But then when it's tested in a wind tunnel the Synthe is nearly as efficient as the fastest time trial helmets. That's a serious win win situation for the performance minded rider. Elaborate internal channeling and 19 gigantic vents provide excellent flow through and take cooling power to new levels while its fit is second to none via the Roc Loc Air retention system. It's fully adjustable and creates a gap between the forehead and the inside of the Bicycle Helmet to further enhance the cooling equation.