I have used Polar Bear for a long time and still do. The Polar Bear I have can be tricky, it's very hard and extremely slippery. When tying it in as a wing, I was taught to keep a little of the under fur at the base as it provided purchase on the longer harder hair. Either that or use the Hass style for winging my flies. The extra under fur is excellent dubbing material, almost seal like.
wcglass