Lazer Genesis RD Helmet: Black/White; 2XS/MD (50-57cm) 2011 Lazer Genesis RD Helmet Black & White; 2XS/MD Fits 50 - 57cm ! Lazer, the world oldest helmet manufacturers still in alive, is the result of over 90 years of experience, passion and dedication. Our objective has always been to find an excellent synergy between design, comfort, safety, technology and innovation. Compared to the standard fit systems the Patented 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 fit of the helmet will symmetrically be tightened up without any pressure points on the head. The Rollsys system offers an innovative one hand use and is easy to handle even during riding ! The X-static padding, in combination with air-pads, is the best ventilation technology on the market today. The combination of X-static padding and the air-pads provide the most efficient method to keep your helmet well ventilated. Proven by US Special Forces, NASA Astronauts and Olympic athletes, X-STATIC delivers unmatched protection and performance. Made with 99.9% pure silver, X-STATIC enhances products with permanent anti-odour and antimicrobial performance. It naturally inhibits the growth of bacteria in fabrics, keeping odours in check and your helmet smelling fresher. X-STATIC also has natural temperature regulating properties, reflecting heat back to keep you warm and evaporating moisture faster to keep you cool. RBS is an internal reinforcement, molded inside the helmet foam, to improve impact resistance and guarantee a better performing helmet during a crash. The helmet foam may crack or shatter during the initial impact, but RBS will keep the helmet foam together and in place around the riders head to offer additional crash protection.