From Team Fortress Wiki
The Jingle Belt is a community-created Miscellaneous item for the Pyro. It is a set of four team-colored bells that replaces the Pyro's napalm grenades on its chest. As the player moves, the bells will jingle and move.
The Jingle Belt will appear in Pyroland as three baby bottles strapped to Pyro's chest.
- The Jingle Belt was added to the game.
- While in Pyrovision, the Jingle Belt appears as 3 baby bottles strapped across the Pyro's chest.
- The Jingle Belt was first teased on the first day of the Australian Christmas 2011 update, with the Pyro seen wearing it.
- The Jingle Belt's name is a pun on "Jingle Bells", a famous Christmas carol.