Doc, the boot blankets are made by Arctic Shield and are worth their weight in gold for stand hunting, as are all of the Arctic Shield products. It is all I use for hunting Kansas and Nebraska where I have to stay out all day in cold driving winds. They come with a sticker that is a caution about being too hot. I thought it was a marketing gimmic (probably still is) until I was sitting on top of a ridge last winter watching my farorite whitetail draw with the -20 wind chill and I got hot and had to unzip the parka. I stayed there for five hours without a problem. I have the whole set now, parka, bibs, boot blankets, double layer gloves. All from the same place.