Lazer Helmets P'Nut Bike Helmet - Kids Magic Buckle eliminates pinching and is super easy to fasten Patented Autofit system brings the Rollsys fit advantage to youth helmets In-Mold construction Change the color and attitude of kid's helmet by adding a crazy nut shell (sold separately) Extra fontanelle padding is soft on the top of the headToddler size fits 46-50cm