I realize this is an old topic but since I'm new to the forum, there are no old topics for me. From reading the various posts, I haven't seen any mention of the Thermacell products. It uses a pad that is heated up via an included butane cartridge. I've used them on a couple of bear hunts in Canada and they have worked fantastically in the right situation. The user needs to be in a stationary position for it to work properly. I've been able to sit in a stand for hours with no gloves or headnet needed. The added bonus is there is no chemical on your hands and body to deal with. It's primarily a mosquito repellant and does give off a faint odor but I don't believe it would affect game sighting much. Available at most sporting goods stores and online.