Youth helmet or for adults with a small head size At Troy Lee Designs, styling, graphics, fit, function, and safety are at the core of all creations. After years of research and development, the team at Troy Lee Designs launched the A1 helmet in 2013. With MIPS rotational brain protection, one of the most comfortable MTB helmets on the market has become even safer. This lightweight and fully encapsulated all-mountain helmet offers maximum coverage and size to keep you safe and protected in all riding conditions. Whether you're riding single trails, hitting dirt jumps, or covering long distances on your XC bike, the A1 helmet provides the top-notch fit, protection, and style you desire. "The A1 Classic MIPS helmet receives the highest safety ratings, achieving a perfect 5-star rating in Virginia Tech's Impact Test and was the number one tested MOUNTAIN helmet." - VA Tech Helmet Testing Laboratory The EPS inner shell maximizes impact protection while minimizing weight. Fiber-reinforced shell from aerospace materials. Innovative breakaway visor screws reduce the likelihood of the visor getting caught during a fall. 16 high-flow air intake and exhaust vents for maximum ventilation. Ultra-soft, quick-drying comfort liner is removable and washable for long-lasting comfort.