When the ThermaCELLs started showing up a few years ago, I was very skeptical. I thought there was no way on Earth that these things could thwart the biblical plague of blood suckers on a black bear bait. However, I kept hearing how great they were, so I decided to give them a try, and I remember the first time I used one on a bear bait. As soon as I stopped the boat on the river, the swarms came out, and I had about had it by the time I sat down on the stand. After the ThermaCELL got heated up, however, things changed. After about 10 minutes, it was as if there wasn't a single mosquito in the woods! I was sold then and there, and since then I have never had to wear even a head net while sitting on a stand, something that was unheard of before.