OAKLEY ARO3 HELMETWhen you're riding, you always want to be wearing a helmet to help protect against unnecessary injuries. The Oakley ARO3 Helmet is designed for riders who enjoy unforgiving climbs and riding in all weather conditions. The ventilation of the ARO3 will keep you cool when it gets hot out. It features a Boa FS1-1 360deg fit system for ultimate comfort and fit, MIPS to help protect you from angled impacts, and a moisture-wicking brow pad.FeaturesLightweight polycarbonate shell has integrated eyewear dock to securely store your glassesX-Static brow padding inhibits the growth of bacteria on fabric and eliminates odorMIPS reduces rotational motion transferred to the brain from angled impactsSPECIFICATIONSShell MaterialPolycarbonateCore MaterialEPS FoamVents-Safety CertificationsCPSCIntended UseRoadWeight295 GramsSize ChartSizeSmallMediumLargeSize Range (in)6-1/2" - 7-1/8"6-3/4" - 7-3/8"7-1/8" - 7-5/8"Size Range (cm)52cm - 56cm54cm - 58cm56cm - 60cm | Oakley Aro3 Helmet Men's Size Medium in Atomic Blue