Where classic styling meets everlasting value, the all new mission brings the proven fit and function of Smith helmets to an audience who will never again call this piece of gear ‘just a helmet’. Protection: lightweight in-mold construction, Aero core construction featuring Koroyd, regulator adjustable climate control, 14 vents fit: adjustable dial fit system (dfs2), Snap fit SL ear pads integration: AirEvac 2 ventilation, outdoor tech audio systems available size: small 51-55cm medium 55-59cm large 59-63cm x large 63-67 cm certification: ASTM f 2040, CE EN 1077: 2007 class b weight 17.5oz/450G.