The aerodynamic Eclipse Spherical is our most sophisticated, stylish, and lightweight aero road helmet, and it's crafted with spherical technology powered by MIPSĀ®, so you can ride with more comfort and an additional layer of protection. Not only is Eclipse Spherical a big step up from the speed of Giro's previously fastest aero road helmet, the Vanquish, it is the fastest road helmet Giro has ever tested. Eclipse beats the closest aero road helmet competitor by 14 seconds over 100 miles at 25mph, and is a full minute faster than Giro's own Vanquish. (Wind Averaged Drag, combination of 80% typical riding position and 20% head down riding position.)