Earmuffs

"Uh, you know, those loud noises?"

- Yellow Face

Earmuffs are one of the things that have been advertised by Yellow Face. This advertisement took place before the intro in the 6th episode of Battle For BFDI, "Four Goes Too Far".

Description
These earmuffs are used to protect your ears from loud noises, possibly including Four's screech. They contain 8 artificial ingredients, and are colored blue, white, and gray.

They are over-sized on Yellow Face, so they are likely very big.