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New inmolded road helmet with patented Rollsys fitting system to improve cycling comfort. The O2 counts 24 air vents for optimum ventilation. Available as unisize model (53-61cm) and in XL-XXL (61-64cm). A separate visor will be available so the O2 can be used as an XC/Mountain bike version. The Lazer Rollsys system is a fully integrated mechanism which surrounds the head completely. By turning a smooth thumb wheel situated on top of the helmet the Rollsys system permits an accurate and progressive peripheral sizing adjustment. The helmet tights up symmetrically without pressure points on the head. The system is ponytail friendly as well.