Their fur is actually colorless and hollow. The limited heat from the sun is collected in the hollow hairs and transmitted down to the bear's skin which, due to it's dark color absorbs the heat keeping them nice and toasty even in frigid waters.
Also, compared to other bears their ears are small and close to the head so they won't freeze.
And they have bumps on their feet to keep them from slipping on the ice and snow.
I wonder if that where they got the idea to put little non-slip bumps on socks?
I love how God made them perfectly suited for their climate.
