TRAJECTA. The new name for stylish, class-leading performance and safety features in an all mountain/enduro helmet. Designed from inception with the Smartshock® Rotational Protective System, you won't find a more breathable, ultralight and comfortable helmet that helps keep you out there all day long. FEATURES Smartshock® Rotational Protective System (13 point). Incredibly light, full face enduro and all mountain all arounder. Multi-Density EPS foam injection molded with polycarbonate in two size specific molds (SM, MD and LG, XL). Patent-pending chin bar integration. Massive airfl ow with a class-leading 24 ventilation ports. Multi-point adjustable visor designed for maximum vision and goggle stowage. Washable, moisture-wicking anti-microbial liner. Fidlock SNAP magnetic buckle (NEW for 2021). Size Guide table, th, td { border: 1px solid black; border-collapse: collapse; } th, td { padding: 15px; }  SIZE US SIZE EU CHEEK PAD SPARE CHEEK PAD LINER SPARE LINER LINER COMPATIBILITY NECK ROLL SPARE NECK ROLL S 52 - 56 32MM 35MM 20MM 16MM S or M 20MM 16MM M 56 - 58 25MM 25MM 16MM 20MM S or M 16MM 20MM L 58 - 61 20MM 20MM 20MM 16MM L or XL 20MM 16MM XL 61 - 64 25MM 25MM 16MM 20MM L or XL 16MM 20MM