To use this Raskullz Pink Astro Cat Helmet, first adjust the nylon straps to fit your toddler's head size between 48 - 52 cm. Make sure the helmet sits comfortably on the head. When your toddler is out and about, this helmet will protect their head with its shock - absorbing inner shell. Remember, always check the helmet for any signs of damage before use. To maintain it, you can wipe it clean with a soft, damp cloth. Don't expose it to extreme heat or sharp objects. This way, the helmet will last longer and keep your little one safe and stylish.