Originally Posted By: Tarzan
I carry a GI poncho liner, a bit bulkier than many alternatives but a very utilitarian piece of gear. Hypothermia is the real killer where I live and I don't consider wrapping myself in aluminum foil or mylar the best strategy to avoid it.

I hope you've tried that before. A poncho liner isn't the be-all and end-all. I've had lots of nights I'd wake up shivering when I was sleeping in the fire station (thermometer at 68, me in my shorts and Tshirt). I can't imagine using it when it was cooler than that, you're on cold ground, and it's wet.