Whether your little rider is lucky enough to ride to school or just enjoys cruising the neighborhood, the Smith Transit Jr. Bike Helmet is all in with a lightweight, ventilated feel. A Mips® Safety System adds advanced impact protection, and there's a dedicated space for our Transit Light, which offers increased visibility any time of day. A good fit is the foundation of helmet safety, so it's available in two sizes and includes our dial-adjustable system to fine-tune fit and comfort. Product Details Protection Mips® Safety System reduces rotational forces caused by angled impacts to the head Lightweight in-mold construction fuses the exterior shell and EPS foam for a one-piece design that's lightweight and durable Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older as well as CE EN 1078 and AS/NZS2063 Fit / Integration Two 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 fit AirEvac™ ventilation system integrates with Smith eyewear for fog-free lenses Features 16 fixed vents for consistent airflow Center rear vent compatible with rechargeable Transit Light (sold separately) Performance comfort liner Lightweight, low-bulk single-layer webbing Weight (Size M): 310 g What's Included Smith drawstring helmet bag