As seen in Pokémon Stadium, it is filled with air, as a defeated Jigglypuff, deflates until it is flat. By drawing extra air into its body, it is able to float as demonstrated in Super Smash Bros.
OFFICIALLY LICENSED JIGGLYPUFF HAT: Bioworld is one of the largest pop culture merchandise distributors in the world! They specialize in GUARANTEED licensed Pokemon merchandise and products just like this hat!
EMBROIDERED LOGO: This hat features an embroidered Jigglypuff decorating the front.
ADJUSTABLE SNAPBACK CLOSURE: An adjustable snapback closure makes this baseball hat easy and comfortable to wear on any size head.
MATERIAL: 76% Acrylic 14% Wool, 10% Cotton