I haven't used one, but I know a couple guys that have and love them. I have used a sleeping bag a couple times over the years, and its basically the same concept - only the HBS is customized to be used for hunting with max benefit. I don't even know how much they cost, but I can almost guarantee they are worth the money if you get cold. Luckily for me, I don't get cold easily....or I'd probably buy one. If I ever venture to the colder parts, I'll get one for sure.

I agree...many of usspend TONS of money on the newest crap we don't need, or that won't really help us....then skimp on the stuff we truly need. LOL [8D]