These bike helmets for kids bring style and safety together and are multifunctional. Not only can you use these on your Kiddimoto balance bike but you can use them for cycling, skating and scooters! Our helmets hold the all important AUS/NZ safety standard, which means they have been tested to the enth degree to ensure your noggin is as safe as possible. By measuring about 2-3 cm above the eyebrow,around the circumference of the head, you will get a measurement that should fit into our sizing of: *Small 48cm to 52cm *Medium 52cm to 58cm *Large 58cm to 62cm * Our tip: Take the measurement 3 times to make sure you have the correct numbers.