Nutcase sets the standard for fun when it comes to kid’s helmets. The all-new Little Nutty raises the bar again featuring industry safety leader MIPS in addition to being filled with protective Crumple Zone EPS foam and 11 cooling vents. SIZING: Fits head circumference 48-52cm (please measure circumference 1cm above eyebrows) FEATURES: Durable Injection molded ABS shell with engineered Crumple Zone EPS protective foam featuring MIPS Safety Protection New improved visor included! CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older