Using this Raskullz T - Rex helmet is easy. First, adjust the nylon straps so the helmet fits snugly on your child's head, with a size between 50 - 54 cm. Make sure the helmet covers the top of the head and sits level. When your child is riding, always double - check that the helmet is securely fastened. For maintenance, use a mild soap and water to clean the outer shell and straps. Let it air dry completely. Avoid exposing the helmet to extreme heat or direct sunlight for long periods. Remember, this helmet is designed for kids aged 5 to 8, so don't let younger or older children use it. Check the helmet regularly for any signs of damage, and replace it if there are cracks or other issues.