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). Don\'t want to look like a tyrannosaurus-wreck for your next costume party? Well there\'s no need to take Jurassic measures, just wear our inflatable Triceratops!! Slip into this costume and no other costume will tricera-top yours! With the illusion effect of riding on the dinosaurs back, this costume is perfect for wowing your friends at Halloween, during Carnival or for a Jurassic themed party!