From the visor to the vents and extended back coverage, it has all the design features of the big kid helmets. The right fit is key, so it's available in two sizes and includes our dial-adjustable system to fine tune fit and comfort.ProtectionMips® Safety System reduces rotational forces caused by angled impacts to the headLightweight in-mold construction fuses the exterior shell and EPS foam for a one-piece design that's lightweight and durableComplies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older as well as CE EN 1078 and AS/NZS2063Fit / IntegrationTwo sizes available: Youth X-Small (48-52cm, age range: 4-8); Youth Small (51-55cm, age range: 8-12)Adjustable dial fit system for a customized fitAirEvacventilation system integrates with Smith eyewear for fog-free lensesFeatures12 fixed vents for consistent airflowIntegrated visorPerformance comfort linerLightweight, low-bulk single-layer webbingWeight (Size M): 310 g