Details The Smith Wilder Jr. Mountain Bike Helmet for Kids combines the enhanced angle impact protection of Mips® with a lightweight, ventilated design just like the adult helmets. 21 fixed vents keep the air flowing as kids bomb down their favorite trails. The adjustable dial fit system adjusts around the head with the turn of a dial to get the right fit every time. There's a built-in visor to cut glare and integrated sunglasses storage, so kids can stow their glasses just like mom or dad. When your young rider is dedicated to the dirt, you need gear that keeps pace with their skill set. Construction Lightweight in-mold construction Mips® Brain Protection System reduces rotational forces caused by angled impacts to the head Integrated visor Lightweight, low-bulk single layer webbing Fit Adjustable dial fit system for a customized fit Designed for ultimate integration with Smith performance eyewear and goggles for maximum comfort,venting and storage convenience Ventilation AirEvac ventilation system integrates with Smith goggles and eyewear for fog-free lenses 20 fixed vents for consistent airflow Details Performance comfort lining Helmet Size Youth Small 48-52cm / 19-20.5" Weight 10oz / 270g Size XS Smith Wilder Jr. Bicycle Helmet Kids'