Troy Lee Designs A2 helmet redefines mountain bike safety, style, comfort and ventilation. The first helmet in its class to combine EPP (for slow speed impacts) and EPS (for high-speed impacts) in one sleek package, that will set a new benchmark for mountain bike helmets. TLD took the popular A1 and perfected it, resulting in the incredible A2. Overall, the A2 offers a higher level of protection thanks to the reinforced shell liner and MIPS technologies available in certain models. It has fantastic ventilation which comes from the six large pressurizing intake passages and seven rear vacuum exhausts which are linked by deep internal channelling to promote efficient cooling and airflow. A combination of quick-wicking foam liner, adjustable rear stabilizer and a no fuss fit system for a perfect fit every time, this will be the go-to helmet for hitting the trails. MIPS Patented Brain Protection System MIPS stands for Multi-directional Impact Protection System, it is a revolutionary technology that lets the helmet slide relative to the head, adding more protection against rotational violence to the brain caused by angled impacts.