Giro IONOS Bike Helmet

IONOS is the most ventilated and technologically advanced road cycling helmet Giro has ever created. Giro's 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 Giro calls Wind Tunnel™ ventilation, making IONOS the coolest, best-ventilated helmet available. Perfect for keeping Grand Tour champions like Lance Armstrong and Alberto Contador cool on the hottest days and over the most tortuous Alpine climbs.

Features

• Fit System - Roc Loc® 4
• In-mold fuses the helmet's outer shell with the impact-absorbing EPS liner. The two materials are fused together, and one is reinforced by the other. This 'exoskeleton' allows Giro to engineer helmets that are lighter, more durable and better ventilated.
• Ventilation 21 Wind Tunnel™ - vents, internal channeling
• In-mold composite sub frame (I.C.S.™)
• X-static padding
• Award winning design
• Multiple Grand Tour championships

Sizing

Small: 20 - 21.75"

Medium: 21.75 - 23.25"

Large: 23.25 - 24.75"