The Micor Toddler Bike Helmets are perfect for little balance bikers, scooters and skaters. An Adjustable Fit Dial System and padded chin strap provide additional comfort while an ABS outer shell and EPS liner ensure child safety. Suitable for heads with a circumference of 48 to 52 centimeters. To ensure a perfect fit, measure the circumference of your child's head starting from the middle of the forehead and make sure it is within range.