Design Philosophy Endura continue to disrupt the helmet market with the new MT500 Full Face Helmet. Deploying advanced energy absorber, Koroyd® to provide additional impact resistance while keeping weight to a minimum this new big hitter delivers certified full face protection that can be worn all day long. Class Leading Weight The MT500 Full face Helmet boasts a class leading weight of 640g (size M/L) thanks to the combination of a full Koroyd® core and a unique chin bar construction using an internal skeleton to provide lightweight impact strength to exceed ASTM, CSPC and EN standards. Koroyd® Core Endura/Koroyd® Helmets use 3D formed Koroyd® inserts for enhanced airflow and improved energy absorption in an incredibly lightweight package. This creates the most breathable and lightweight helmets on the market while also providing superior impact protection over standard construction. 90 days satisfaction guarantee So confident are we in this product that, if you are not entirely satisfied with it then we offer a no-quibble refund or replacement policy within 90 days of purchase.