Here’s the techie bit - the Bio Down Jacket uses AMNI SOUL ECO nylon insulated with Responsible Down Standard (RDS) 600-fill-power duck down. And no, it won’t start degrading as you wear it ...

But with one of the best winter dog coats, bad weather doesn't have to mean a day stuck indoors. To help us nail down the best insulated winter jackets, we spoke with 13 dog walkers and trainers ...