One size fits most adults. Perfect for Halloween or Carnival season. Easy and simple one piece slip on. Fan inflates costume in seconds & lasts up to 7 hours. Requires 4 x AA batteries (not included). Ready to turn a new leaf in your cater-logue of bad costumes? Look no further! 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!