evo.com | Smith Bike Helmets > Big-bike style meets little-rider protection in the Sidekick Jr. MIPS, featuring extended coverage and dial-adjust comfort for growing rippers. This mini mountain bike lid packs all the features of its grown-up cousins into a trail-ready design that'll have them charging with confidence. 12 Fixed Vents for Consistent Airflow Youth X-Small Size: 48-52cm, Age Range: 4-8 EPS Inner with Polycarbonte Shell Lightweight In-Mold Construction MIPS System Equipped In a helmet with the MIPS Brain Protection System, the shell and liner are separated by a low friction layer that allows the helmet to slide relative to the head in and angled impact. | Kid's Smith Sidekick Jr. MIPS Bike Helmet 2026 - YXS in Black