One size fits most kids aged 5-11. Perfect for Halloween or fancy dress parties. Easy and simple one piece slip on. Fan inflates costume in seconds & lasts up to 7 hours. Requires 4 x AA batteries (not included). Looking for a unique and funny costume for your next party? Our hilarious inflatable Caterpillar costume is one in a million and will be sure to turn heads at your next party! What\'s more is that this costume is great for World Book Day or Carnival Season, or any animal themed costume party!