Giro Ionos Road Cycling Bike Helmet 2010 is the most technologically advanced road cycling helmet Giro has ever created. The Giro Ionos Road Cycling Bike Helmet uses Giro revolutionary In-mold Composite Subframe (I.C.S.) to provide the strength to support 21 of the largest vents ever carved into a helmet. These massive vents, coupled with an intricate network of internal exhaust ports, create a cooling system Giro calls Wind Tunnel ventilation, making the Giro Ionos Road Cycling Bike Helmet the coolest, best-ventilated road helmet anywhere. The 2010 Giro Ionos Road Cycling Bike Helmet is the ultimate in road cycling. Features:

• Construction In-mold composite Subframe (I.C.S.). Giro In-mold composite skeleton fused into a helmet EPS liner. Visible on the bridges between vents, this series of composite plates is directionally tuned to provide structural support, impact dispersion, and penetration resistance. I.C.S. technology is what allows to Giro to carve those massive vents without compromising rider protection.

• X-static padding - Anti-static soft liner gives the rider and Triathlete head luxury feel and fit without itch or cling.

• Fit System Roc Loc 4 Giro Roc Loc 4 is the industry benchmark for adjustability, durability, and comfort. It offers full adjustment of both fit tension and vertical position, for a truly custom fit that makes Giro helmets more stable on your head, especially on rough roads or technical trails.

• Ventilation 21 Wind Tunnel vents. Giro helmets are developed utilizing their proprietary Wind Tunnel ventilation system, which combines active vents with internal exhaust channels that thrust fresh, cool air over and around the rider head while forcing heat and stale air out at the same time. This measurable increase in cooling due is the single most important performance benefit Giro helmets provide to riders.

• Internal channeling Giro helmets are designed to allow air to circulate within the helmet, allowing the rider's head to be more ventilated.

• Sizes (20-21.75 inches / 51-55 cm); M (21.75 -23.25 inches / 55-59 cm); and L (23.25-24.75 inches / 59-63 cm)