The sizes indicated correspond to your head size in centimeters. You must take the same size for the foam as the one you took for the helmet. Streamlined helmet for a 180° vision. Lightness, comfort and ventilation. Multi-purpose helmet thanks to its magnetic visor. Durgiten shell (ABS/PC), polystyrene interior with mesh lining on the edge. XP chinstrap in semi-rigid carbon fiber and greenpoxy resin for extra protection and better helmet fit. Magnetic buckle Fidlock. Metal ventilation grids. Made in France. Helmet CE marked, conforms to EN1384:2017, ALIENOR certification. Standard ASTMF1163-15 - SEI in progress. Helmets are sold without visor and foam. These can be purchased separately on our website.