Sidewalk, pump track or trail, inspire your little ripper with some big kid style. The Smith Sidekick Jr. Mountain Bike Helmet packs classic MTB style and Mips® Safety System crash protection into a helmet for the youngest dirt riders. 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. FEATURES: 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: 12 fixed vents for consistent airflow Center rear vent compatible with rechargeable Transit Light (sold separately) Integrated visor Performance comfort liner Lightweight, low-bulk single-layer webbing Weight (Size M): 310 g