Giro introduces the top-of-the-line Ionos (pronounced eye-oh-nOs) road bike helmet.

• After three years in the development process, Ionos was tested by 27 riders who together logged over 50,000 miles in the '07 Tour de France
• Based on their feedback, Giro developed its lightest, coolest, toughest helmet yet—the Ionos
• Through Giro's careful sculpting, weight scrutinization and use of lightweight materials, the Ionos seems to disappear when you put it on
• Ionos is built around 21 massive vents and features a system of ventilation channels throughout the liner
• Internal exhaust channels thrust cool, fresh air over and around the head while forcing heat and stale air out
• In-mold technology fuses the liner with the microshell to create an exo-skeleton that's light, cool, and exceptionally durable
• In addition, the subframe is reinforced around the ribs and vents for incredible structural support, impact dispersion and penetration resistance
• Roc Loc 4® offers full adjustment of the fit tension and the helmet's vertical position, for a truly personalized fit
• Giro's proprietary fitting system results in a helmet that fits 98% of the population, yet looks as if it was made just for you

Sizing:

• Small fits 20 - 21.75 in.
• Medium fits 21.75 - 23.25 in.
• Large fits 23.25 - 24.75 in.

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