Giro Ionos Road Helmet '09. Simply put, Ionos is the most technologically advanced road cycling helmet Giro has ever created. And the most beautiful. And the most ventilated. 21 enormous Wind Tunnel vents and optimally placed internal exhaust channels maximize air flow across your head, ensuring that you stay cool on the hottest days and over the longest climbs.

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Features:

Fit System: Roc Loc 4

Construction: In-mold

Ventilation: 21 Wind Tunnel vents. Internal channeling.

Additional features: In-mold composite sub frame, X-static padding.

Sizes: Super Fit. Small(20"-21.75" / 51-55cm), Medium(21.75"-23.25" / 55-59cm), Large(23.25"-24.75" / 59-63cm).