Patty Skates are a pair of skates which SpongeBob creates to skate around the Krusty Krab in the episode "Krabs à la Mode." SpongeBob, Squidward, and many other customers use these when the Krusty Krab is at a negative temperature.
They look like frozen patties with bands holding the wearer's shoes and the patties together.
Role in episode
After Plankton turned up the thermostat in the Krusty Krab, the restaurant was covered in ice on the ceiling and the floor, and this resulted in a loss of customers as SpongeBob and Squidward were unable to give the customers' orders. However, SpongeBob came up with the idea to use Patty Skates and attracted customers back to the Krusty Krab.