The Kinderfeets Toddler Bike Helmets are perfect for little balance bikers, scooters and skaters. Two sets of Sweatsaver Fit Pads are included and ventilation holes generate maximum airflow so little ones can ride all day long! Suitable for toddler heads (circumference of 18 to 20.5 inches / 46 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.