Giro Athlon

If your mountain biking leans more towards timing chips and podium appearances, Giro's Athlon is the helmet for you. Its Giro In-Mold construction provides low weight and durability, while the 23 Giro Wind Tunnel vents keep the air flowing so you stay comfy all-ride long. Giro's super-simple Roc Loc 5 retention system ensures a perfect fit, and the removable visor shields your eyes from the sun.

- Small = 51-55cm
- Medium = 55-59cm
- Large = 59-63cm