The Air Attack Shield is the most aerodynamic version of the Air Attack aero road helmet which includes an integrated eye shield that attaches with magnets. The magnets allow the eye shield to be super easily flipped out of view in case it rains.
Anyone who has studied bicycle aerodynamics knows an aero helmet can be as or even more beneficial than an aero frame or even aero wheels. The problem is most aero helmets don't vent that well and are a tad on the heavy side.
To fulfill the roadie's need for speed, Giro developed the Air Attack specifically to deliver a dose of free velocity on the road bike. Giro claims the Air Attack is the most aero road helmet ever product saving an estimated 17 seconds over 40 kilometers. Pro Tour riders are increasingly using the Air Attack and we have heard wind tunnel stories of surprisingly major watt savings.
Since road cyclists put a premium on venting but vents need to be kept to a minimum for aerodynamics, Giro maximized the performance of the six small vents with an internal channel design plus a new Roc Loc Air retention system.
The Roc Loc® Air system features a unique design that suspends the helmet 3mm above the head. It creates an optimized path for air to flow through the helmet with a Venturi effect that increases efficiency of the vents and internal ventilation channels. Like the acclaimed Roc Loc5, it also offers micro-adjustable tensioning and vertical positioning adjustments, so you can fine-tune the fit and tilt on the fly with one hand.
I have one of the first ones; gloss black and red strpe. My favorite helmet, and I have raced for 20 years up to/including national masters. I have had ~ 20 helments from sponsors and have bought them as well. this one shields your head from the sun with the reduced vents, but remains cool. I suggest the shield model, because removed it is still stylish to ride in and you have the shield option. The shield lens is quality by Zeiss.The base lens is smoke but a clear is available. I raced a crit with the shield and vision field is good. As an engineer, I personally think more solid surface area is good to prevent unusual penetrations that can happen with a more slotted/vented helmet. I don't review many products; no relationship to the mfgr.This is one bad ride; a heck of a product from Giro.