Don’t Understand This Joke

[RabbitsRock]

Anyone get this?
Q - What does Father Christmas wear on a long sleigh ride?
A - Depends

Really don’t get it! Am I missing something?

Depends are a US brand of incontinence underwear. Does that help?

Still not funny though.

Is Depends a brand of incontinence underwear where the crackers were made?

Depends is an American version of Tena. So incontinence underwear but also "depends" how he feels?
Maybe?