Worn in the Tour de France and now available to wind- cheating riders everywhere, the TT2 helmet is miles ahead of the competition when it comes to aerodynamic drag reduction, strategic ventilation and comfortable fit. Complies with bullet. Complies with one or more of the following safety standards for bicycle helmets: CPSE, SNELL, B9OA, CE and AS/NZS. Design developed in tandem with wind tunnel testing, for a quantifiable reduction in drag. 4th Dimension Cooling System effectively channels air and strategically placed Mouthport reduces drag. Hydrophobic 4X DryLite webbing is comfortable, secure and won't stretch out with rain or sweat. U-Turn tri- glide-style adjusters are easier to use and lock firmly in place once adjusted. Unique ProFit retention system provides a precise fit with true one-hand adjustment. Size M/L 55-61 cm.