2011 Giro Ionos Bicycle Helmet Matte Titanium NEW!

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Ionos is the most ventilated and technologically advanced road cycling helmet Giro has ever created. Our proprietary in-mold composite sub-frame (I.C.S.) provides the strength to support 21 of the largest vents ever carved into a helmet. These massive vents-coupled with an intricate network of internal channels-create a cooling system we call Wind Tunnel ventilation. The difference is remarkable and after one ride you'll agree: the Ionos is the coolest, best-ventilated helmet available. This is the reason that Grand Tour champions like Lance Armstrong and Alberto Contador choose Ionos to stay cool on the hottest days. Small: 20" - 21.75" (51cm - 55cm) Medium: 21.75" - 23.25" (55cm - 59cm) Large: 23.25" - 24.75" (59cm - 63cm)