I am thinking about this product also. I have an acquaintance at work that has the parka and bibs ( the H3 model apparently they have an H5 model out now) He hunted in Canada, said it was 20 below and he was very comfortable. He loved them. Said they made a slight rustling noise but had no problems drawing on deer with his bow. But, I have no personal experience with it. Don't know if I would be better of with parka and bibs or something like the heaterbodysuit.