The Inflatable Pants are a variation of normal pants created by Patrick Star. As the name implies, the pants inflate.
Role in the series
The pants first appear in "Patty Hype" and seem to be activated by a pull-switch that triggers its wearer to have the pants lift them aloft, only to flip upside-down because of the weighted pressure. The first version of the pants had the ability to irrepairably burst off the wearer, upon the wearer's request.
The pants also appear "The Sponge Who Could Fly," when SpongeBob placed a hair dryer in his pants, causing them to inflate. They were later shot down and burst.
The pants make a cameo appearance in the episode "Karate Star."