Lightly used Air Attack. $150 shipped in continental US. Worn half dozen times most, including one 70.3. Never crashed and in great shape. Always kept in case that came with original Atmos (not included as didn't come with helmet). Includes shield that came with helmet that has slight magnet issue (magnet comes apart sometimes, but shield is in great shape) and a BRAND NEW shield in box. Silver Flash is the new shield. Helmet is the original black/red/white model. This link shows you how it looks but is not the same helmet and I am not that seller......http://www.ebay.ca/...;hash=item1e98f1785a.
Here's description from Giro.
http://www.giro.com/...r-attack-shield.html
BUILT FOR SPEED
Our first Air Attack™ was a revelation in styling and performance for all types of riding. Inspired by the original, the new generation Air Attack™ Shield delivers a lightweight, compact and extremely efficient aerodynamic design that slices through air. Features a magnetically fastened eye shield for wraparound eye protection that's easy to remove during pre-race or warm-up. With an enhanced airflow design and the Roc Loc® Air system, this helmet has redefined the benchmark for performance.
Specifications
Features: Optical shield w/ magnetic attachment (Gray/Silver Flash included. Clear/Silver Flash available), Wind tunnel aided design, Removable X-Static comfort padding, Featherweight webbing with Slimline buckle
Construction: In-Mold polycarbonate shell with EPS liner
Fit System: Roc Loc Air Ventilation6 vents, internal channeling 
Here's description from Giro.
http://www.giro.com/...r-attack-shield.html
BUILT FOR SPEED
Our first Air Attack™ was a revelation in styling and performance for all types of riding. Inspired by the original, the new generation Air Attack™ Shield delivers a lightweight, compact and extremely efficient aerodynamic design that slices through air. Features a magnetically fastened eye shield for wraparound eye protection that's easy to remove during pre-race or warm-up. With an enhanced airflow design and the Roc Loc® Air system, this helmet has redefined the benchmark for performance.
Specifications
Features: Optical shield w/ magnetic attachment (Gray/Silver Flash included. Clear/Silver Flash available), Wind tunnel aided design, Removable X-Static comfort padding, Featherweight webbing with Slimline buckle
Construction: In-Mold polycarbonate shell with EPS liner
Fit System: Roc Loc Air Ventilation6 vents, internal channeling