Using this Raskullz lady - bug helmet is easy. Just put it on your toddler's head and adjust the straps to fit snugly. Make sure the helmet covers the top of the head and sits level. Always check the fit before each ride. When it comes to safety, remember this helmet is only for kids 3 - 5 years old with head sizes between 48 - 52 cm. Don't let your child wear it in situations it's not designed for, like rough play off the bike. To keep it in good shape, clean it with a mild soap and water. Wipe it dry with a soft cloth and store it in a cool, dry place.