The Atomic Mentor Jr. is a great helmet for your little skier. A highly durable In-Mold Construction provides plenty of protection while still maintaining a lightweight feeling your juniors head. Atomic's Fit System delivers up to 3cm of adjustment to have that perfect fit for at least a few seasons. Aircon Venting keeps air moving through the helmet to always keep your little skier from overheating. Mom's love that the Liner can be removed and washed to prevent it from getting stinky or funky. Atomic Fit System, In-Mold Shell, Aircon Venting, Removable and Washable Full Cap Lining, Sm-53-56cm, Certifications: ASTM F 2040/CE EN 1077:2007 Class B, Warranty: One Year, Race: No, Category: Half Shell, Audio: Not Compatible, Brim/Visor: No, Ventilation: Fixed, Adjustability: Full, Year Round Capable: No, Shell Construction: In-Mold, Model Year: 2021, Product ID: 609474, Model Number: AN5005998S, GTIN: 0887445224877