Improving protection and impact performance is the number one priority of the Alpinestars Vector helmet. Both Vector helmets are designed with extended coverage.The outer shell is made from a vacuum formed PC in-mold with EPS inner liner and reinforced with a rigid internal frame embedded into the molded helmet.With the Vector Helmet’s inner size ring, riders are able to make easy snap length and height adjustments to improve fitKey Features:19 Openings for effective ventilation.Reinforced with embedded rigid frame.Vacuum formed polycarbonate.Extended side protection.Comfort liner with quik-dry anti-bacterial fabric.Replaceable inner liner pads.Fully adjustable dial sizing system.Quick release chin strap buckle.Adjustable visor for goggles.Designed to accommodate eyewear.Certified to en, cpsc, as.3 Shells available: S (51-55 cm) / M (55-59cm) / L (59-63cm)