POC Omne Air Spin Hydrogen Helmet Matte WhiteThe difference from other POC helmets, the Omne is more oriented to mid-level urban cyclists.The right helmet for cyclists who want light weight, comfort and ventilation at an affordable price, and that looks good with their casual wear.Weight: 288g POC Omne Air Spin Hydrogen Helmet Matte WhiteThe Omne features four generous front vents designed to channel air through the rear vents.Designed to keep you cool in most driving conditions all year roundThe retention system allows a secure fit without pressure points or pinch, and the dial rotates smoothly with no distinct clicks, allowing infinite adjustmentSizes:S: 50-56CM,M: 54-60CM,L: 56-62CMREF: PC107211001