Allan
I use a lot of polar bear and cannot throw away the underfur... I use it for dubbing a lot, both alone and with other stuff added. In split thread it is an amazing material with lots of "build" and it really looks good underwater with tremendous gloss and light-catching. It literally glows in the right light.

For props on Intruders where a ball of dubbing supports the hackle it is unrivaled.

I often tie the Alaska Mary Ann with a dubbed body of PB to go with the PB wing.

A local shop has a complete, 100% legal hide which will be sold (in small pieces) starting soon.