Mavic Sun Metal Rollers Rollers Roller Parts Saddles Saddle Specials Avocet Fizik Misc. Found only on the Giro E2 and Boreas, Wind Tunnel Ventilation is the latest result of our obsession with designing helmets that are cooler than wearing no helmet at all. The design allows air to flow unobstructed through wind tunnels in the helmet. See for yourself. Cool air flows in.
Hot air flows out.
The most advanced Roc Loc system allows you to adjust the fit while the helmet is on your head. Loosen the Roc Loc on climbs. Cinch it down for descents. Micro-adjust the tension for a custom fit. The Roc Loc 3 also features a height adjustment mechanism that adjusts to the unique height and shape of you skull, and is ponytail compatible.