Giro's Sonnet helmet is the perfect choice for all of your rides. It feature's Giro's In-Mold polycarbonate shell for low weight and strength. 25 large vents and Giro's Wind Tunnel technology pull air through the helmet to keep you comfortable, and Giro's Roc Loc 5 retention system secures the Sonnet and lets you achieve the perfect fit.
- Small = 51-55cm
- Medium = 55-59cm
A) Micro Dial - A ratcheting dial that’s simply twisted to tighten and loosen the fit.
B) Three-Position Vertical Fit - Lets you raise and lower the Roc Loc system to the perfect position.
C) Ergonomic Arms - Minimal shape fits comfortably and accommodates eyewear.
D) Dual Pods – Supportive, minimal panels that cradle your head for the utmost in comfort and safety.
E) Strap Management - The straps (not shown) are woven through the fit system to always remain in the right place.