At Troy Lee Designs, styling, graphics, fit, functionality, and safety are central to everything TLD creates. After years of research and development, the Troy Lee Designs team introduced the A1 helmet in 2013. With MIPS rotational brain protection, TLD has made one of the most comfortable MTB helmets on the market even safer. This lightweight, fully encapsulated all-mountain helmet offers maximum coverage and size to keep you safe and protected under all riding conditions. Whether you're riding single trails, tackling dirt jumps, or covering miles on your XC bike, the A1 helmet provides the premium fit, protection, and style you desire. "The A1 Classic MIPS helmet receives the highest safety ratings, achieving a perfect 5-star rating in the Virginia Tech impact test and was the number one tested MOUNTAIN helmet." - VA Tech Helmet Testing Laboratory MIPS Multi-directional Impact Protection System reduces rotational forces on the brain in certain crash scenarios. The EPS inner shell maximizes impact protection and minimizes weight. Fiber-reinforced shell made from aerospace materials. Innovative breakaway visor screws reduce the likelihood of the visor snagging in a fall. 16 high-flow air intake and exhaust vents for maximum ventilation. OneSize 48-54.