Giro Air Attack Bike Bicycle Helmet. Free speed, anyone No matter the discipline road, track, triathlon...even cyclocross! if you're interested in going fast on a bike then the Giro Air Attack Bicycle Helmet will provide just what you need to cheat the wind. Thanks to wind tunnel aided design, this Bicycle Helmet features a lightweight, compact and extremely efficient aerodynamic design that delivers the lowest drag of any road Bicycle Helmet on the market. Way more aero than a regular Bicycle Helmet and a world more comfortable than a full on time trial Bicycle Helmet, with an enhanced airflow design and the Roc Loc Air system the Air Attack has redefined the benchmark for performance.