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). Go all out at your next costume party and bring the real wow factor in our inflatable Deluxe Unicorn costume! Whether you want to mystify your friends in this magical costume, have a laugh wearing it as a group costume at your stag or hen do, or just to shake what your mamma gave ya at your next event, this is the perfect costume to do it in!