661 Comp Shifted Full Face Helmet 2012 Black/White Neck Brace Compatible: Certain technologies work better if the supporting products are designed to work in conjunction with each other. Neck braces are one of those technologies that need products design specifically to work with other safety equipment. Certain helmets, chest protectors, and roost deflectors are designed to work in conjunction with a neck brace to maximize comfort, fit, and motion.

Full helmet Venting System: The Full Helmet Venting System, or FHVS, is a system designed to give maximum airflow by linking channels and vents to create a vortex of airflow pushing warm air out of the helmet allowing cooler air to keep you cool.

Panorama Eye Port: The Panorama full view eye port is designed to give maximum peripheral vision and allow any goggles to fit without interference.

MTB Helmet specifications:
- Polycarbonate shell
- Interior channeling to aid ventilation
- 12 exterior ports
- Complies to standards: CPSC, CE: 1078, AS/NZS 2063
- Suitable for: BMX and DH

To determine the size of 661 helmet you need, measure around the widest point of your head approximately one inch above your eyebrows.

Small: 54-56cm

Medium: 56-58cm

Large: 58-60cm

Extra Large: 60-62cm