Puffa jacket, unclumping the filling?

[Jilljams]

Help! I washed my son’s puffa style jacket (At 30 as said on label). It’s the type of coat with down (except it’s not down, it’s a polyester filling) and it’s all clumped into the middle of the rows. Is the way to unclump it? Otherwise it’s going to be a bit of a lumpy, uneven coat with warm and cold patches

Tennis balls in the tumble drier in low heat

Ah so simple! Thank you. I hope it doesn’t shrink, I don’t have a good track record with tumble dryers and my son’s clothes.

Just make sure you’ve got it on the lowest temperature possible! Takes forever (although polyester probably dries quicker than real down). Plump it up like a pillow when you take it out

Definitely tumble. I do my son's even though it says not to..