Whether you're tackling twisting trails or commuting downtown, the Giro(R) Revel Bike Helmet is up to the task. Designed with a full coverage polycarbonate shell and 22 vents, the Revel delivers superior protection and comfort. Its Acu Dial(TM) Fit system has a full fit band that can be adjusted with one hand mid-ride if necessary. The snap fit visor reduces glare as you ascend winding hills. The Revel is the perfect complement to any ride. FEATURES: Bike Helmet Equipped for trail and road riding Features a full-coverage shell for maximum protection Snap fit visor with reinforced anchor points keeps the sun out of your eyes Acu Dial(TM) Fit system has a full fit band and allows for single-handed adjustment Reflective rear decal enhances safety in low light conditions Ventilation: 22 vents Construction: In-mold polycarbonate shell with EPS liner Giro suggested use: Recreation Style: 7037347 Sizing: Universal Adult Size: Fits 21.25"-24"/ 54-61 cm Complies with U.S. CPSC Safety Standard for Bicycle Helmets for persons age 5 and older