Icebreaker is a company name. I think they make two products.....
The best for waterfowling is a muff....there are several makes but we find the one mentioned to be the warmest.
The most prevalent way to use one is to tie it around your waist and stick your hands in to get warm....
Honestly...
Hi Trip,
The one suggestion I could toss into the mix would be to get a good muff or two.
When it gets really cold you can slip one side over the tiller handle and put your hand into the other side - or do pretty much the same thing with a light. We use Icebreaker muffs - not the most...