SPECS: Lightweight, adjustable helmet designed to keep kids protected and stylish all day on the slopes Certified under ASTM F 2040 and CE EN 1077:2077 Class B Constructed with 14 airflow vents Snapfit SL2 ear pads keep your ears warm in frigid temps and are removable on warmer days DESIGN & TECHNOLOGY: AirEvac(TM) ventilation system offers a fog-free experience on the slopes Grow With Me(TM) liner is equipped with dual stage sizes that expand with your kid as they grow Adjustable dial lets you make simple size changes on the go with the turn of a dial Adjustable vents regulate the climate control within your helmet for the ideal atmosphere In-mold construction combined with a hard exterior shell and EPS foam creates a safe shell for the head that's lightweight and durable SAFETY FEATURES: MIPS(R) Brain Protection System protects the head from harsh rotational forces caused by impact Zonal Koroyd(R) construction provides superior safety and energy absorption in a lightweight, ventilated design SIZING: We recommend you try helmets on before buying. Make sure the helmet fits with a little room when the fit system is loose, and sits low enough to protect your child's forehead without hindering vision. Once you've got the right size, you can adjust the fit.