At Troy Lee Designs, style, graphics, fit, function and safety are central to everything TLD creates. After years of research and development, the team at Troy Lee Designs introduced the A1 helmet in 2013. With MIPS rotating brain protection, TLD has made one of the most comfortable mountain bike helmets on the market even safer. This lightweight, fully encapsulated all-mountain helmet offers maximum coverage and size to keep you safe and protected in all riding conditions. Whether you're singletrailing, dirtjumping or racking up the miles on an XC bike, the A1 helmet offers the first-class fit, protection and style you're looking for. The A1 Classic MIPS helmet achieves the highest safety ratings, earned a perfect 5-star rating in the Virginia Techs impact test and was the number one MOUNTAIN helmet tested. rotational forces on the brain in certain crash scenarios. The EPS inner shell maximizes impact protection and minimizes weight. Shell reinforced with aerospace fibers The innovative frangible visor screws reduce the likelihood of the visor blocking in the event of a fall. 16 high-flow air inlet and outlet openings for maximum ventilation