Offering the widest size range of any kids&'; Smith helmet, the Smith Glide Jr. snow helmet ensures a good fit with an intuitive dial control, and it includes the advanced impact protection of MipsAA(R). Features Lightweight in-mold construction fuses the exterior shell and EPS foam for a one-piece design that&';s lightweight and durable Rotational motion can cause brain injuries; with MipsAA(R), a low-friction layer slides 10 to 15 mm in all directions, reducing rotational motion to the brain during impact Adjustable dial fit for easy, on-the-go size adjustment Plush, fuzzy lining adds warmth and comfort Designed for ultimate integration with Smith eyewear for maximum comfort and venting AirEvaca;"A ventilation system integrates with Smith goggles for fog-free lenses Fixed vents for consistent airflow Certification: ASTM F 2040, CE EN 1077:2007 CLASS B