Using this helmet is easy. First, adjust the KidFit system to fit your child's head properly. Make sure the side buckle is fastened securely but not too tight. When your child is in the baby seat, trailer, or cargo bike, place the helmet on their head with the flat back panel at the back. To remove the helmet, simply unclip the side buckle. Remember to check the fit regularly as your child grows. Clean the helmet with a mild soap and water, and let it air - dry. Don't use harsh chemicals or expose it to high heat. Keep it away from sharp objects to avoid damage. Attach the Universal Lazer LED at the rear for better safety and visibility when needed.