evo.com | Giro Bike Helmets > The Giro Merit Spherical MIPS(R) is jam-packed with features to cover your head on rowdy rides. Spherical Technology combined with MIPS(R) offers premium protection by mitigating rotational energy with Progressive Layering(TM) EPS and EPP foam for different impact speeds. Wind tunnel vents keep the air flowing and the Roc Loc(R) Air Fit system ensures a dialed fit for the ultimate protective performance. Roc Loc(R) Air DH Adjustable fit system enhances the helmet's comfort, stability, and interior ventilation while reducing the chances of accidental adjustment. Wind Tunnel(TM) Ventilation Giro helmets are developed utilizing the proprietary Wind Tunnel(TM) ventilation system, which combines active vents with internal exhaust channels that thrust cool, fresh air over and around the riders head-while forcing heat and stale air out. This significant increase in air channeling makes a difference that riders will immediately feel and appreciate. In-Mold Polycarbonate Shell Hardshell with In-Mold Hardbody(TM) Lower Wrap The two-piece shell combines a tough outer hard shell with a polycarbonate lower shell permanently fused to the liner for durability without excess weight. Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older | Giro Merit Spherical MIPS Bike Helmet - Medium in Gray