Mocoz Cosplay Adult Halloween Costume Inflatable dinosaur costume 100% nylon FREE HAT INCLUDED 100% Nylon Requires 4 x AA Batteries (not included) One size fits all. Perfect for a fancy dress party this Inflatable t-rex costume will make you the member to remember, and with a battery pack that can keep it inflated for up to seven hours there will plenty of time for fun and frolics.?Forget sheet ghosts and comedy wigs, if you really want to steal the show at a fancy dress party, this is the way to go.?Simply step inside the costume and click your battery belt clip to turn on the fan. Once zipped up, the costume inflates in seconds.