Previously worn solely by overweight film directors braving the cold on-set or fashionable skiers, these feather down parkas have gone universal, see Sienna Miller, Emma Stone and Victoria Beckham for further evidence.
But be warned, they're not cheap. Starting from around £500, they may keep you warm but, they could freeze your liquid assets.
Still keen? Now you just have to decide - am I Canada Goose girl or Moncler?
The latter being jazzier, the former, less 'fitted'. They have become the Taylor Swift and Katy Perry of the coat world: both have legions of loyal fans but aren't so keen on one another.
NB: when wearing a Moncler, try not to sit next to Canada Geese, it will only end in tears.
Their duvet credentials mean that, not only do they hide the Christmas pounds, they actually keep you warm so you can brave those Baltic months and walk to work, or trudge from one fireside tipple to the next - unscathed.
In combining functionality with fashion, these coats cover those worlds apart; from city bankers to fashion editors, University students to Russian dogsled racers. They have become a must for both the stylish and the steady.
While almost monopolising the fashion outerworld, their options have flourished - who knew functionality could be so colourful?
As the cold draws in, look out for the celebrity puffa parade - both on and off the ski slopes.
For more trends that celebrities have picked up on, take a look at our Best Dressed of the Week gallery below:
