Using this Raskullz T - Rex Bonez helmet is easy. First, adjust the nylon straps so the helmet fits snugly on your toddler's head. The integrated fit system helps with getting the right fit. Make sure the helmet covers the top and sides of the head properly. When it comes to safety, always check the helmet for any damage before use. If there are cracks or the shock - absorbing EPS inner shell seems damaged, don't use it. For maintenance, you can wipe the outer shell with a damp cloth to keep it clean. Avoid using harsh chemicals as they might damage the graphics. Store the helmet in a cool, dry place when not in use. Remember, this helmet is designed for toddlers aged 3 to 5 with head sizes 48 - 52 cm, so make sure it's the right fit for your child.