To use this dino explorer costume set, first, check the Rubies size chart to find the right fit for your child. Slip on the printed T - shirt, and then put on the matching hat. Your child is now ready to go on a dino - adventure! When it comes to care, this 100% polyester costume is easy to maintain. You can machine - wash it on a gentle cycle with cold water. Avoid using bleach as it may damage the fabric. After washing, let it air - dry. Keep it in a cool, dry place when not in use. Make sure to check the hat for any loose parts regularly to ensure your child's safety during play.