Our line of Little Nutty helmets comes with a spin dial at the back to give your child a snug and comfortable fitting helmet. It also has 360 degree reflectivity and, best of all, the revolutionary magnetic buckle, meaning no more pinching of their chin! Durable ABS shell Protective EPS shock-absorbing liner Magnetic buckle means no pinching! Front, top & back venting Adjustable spin dial allows for a snug & comfortable fit Deluxe soft chin pad for extra comfort 360 degree reflectivity CPSC Certification BE SURE TO MEASURE YOUR HEAD BEFORE YOU ORDER! All Nutcase bike helmets comply with the US CPSC Safety Standards for bicycle helmets for persons age 5 and older.