Giro Ionos Helmet
The Ionos is the most ventilated and technologically advanced road cycling helmet Giro has ever created. Using their proprietary in-mold composite sub-frame (I.C.S.™) they have been able to produce a helmet with  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 like no other. The difference is remarkable, and after one ride you’ll agree: the Ionos is the coolest, best-ventilated helmet available. Great for a hot Australian summer of riding, and is the reason you will see so many grand tour riders riding with this helmet.
 
Roc Loc 5: After more than two-years of development, Giro introduces Roc Loc 5. This groundbreaking fit system provides an entirely unique user experience with an unmatched level of comfort, stability, adjustability and weight savings. With Roc Loc 5, you can easily dial-in both fit tension and adjust vertical position with a single hand. Just twist the dial for a tighter feel on rough terrain, then back it off a notch and relax across the flats or a warm climb. Even with these remarkable features, Roc Loc 5 is still nearly 40-percent lighter than its popular predecessor, Roc Loc 4.
 
Micro Dial: The heart of Roc Loc 5 is this ratcheting, micro-adjusting dial. A simple, two-finger twist of the Micro Dial opens or closes the retention system and each click is audible.
 
Three-Position Bracket: It’s never been easier to change vertical positions and fine-tune fit. We incorporated a three-position bracket that features 15-millimeters of up/down movement. Like the Micro Dial, this system can be adjusted without removing the helmet. Carefully-crafted ergonomic arms are shaped to be as comfortable as possible, yet work flawlessly with Giro eyewear (what we call Super Fit engineering).
 
Dual Pods: These two panels are designed to firmly grasp the back of your head while comfortably cradling the occipital lobe.
Strap Baskets: With Roc Loc 5, your helmet straps are always right where you need them. Not to mention this strap basket brings a new level of comfort.
 
X-static Helmet Padding: In addition to being very comfortable, our X-Static pads provide anti-microbial properties to help keep your helmet fresher, longer. The pads are also machine washable.
 
Wind tunnel ventilation: Giro helmets are developed utilizing our proprietary Wind Tunnel™ ventilation system, which combines active vents with internal exhaust channels that thrust cool, fresh air over and around the riders head-while forcing heat and stale air out. This significant increase in air channeling makes a difference that riders will immediately feel and appreciate.
 
In-Mold Technology: Our In-mold composite Sub-frame is a composite skeleton fused into a helmet’s 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 us to carve those massive vents— as seen in our Ionos helmet, for example—without compromising rider protection.

The Giro Ionus features:

• For Road use
• In-Mold Composite Subframe
• EPS Foam Core
• 21 Vents with Wind Tunnel Ventilation
• Roc Loc 5 adjustment system
• Sizes: Small (51-55cm), Medium (55-59cm) and Large (59-63cm)
• Weight: 320 grams