I picked up an Alpaca hat with earflaps and a matching head tube thingy that makes for a great balaclava together. It is light and soft and very warm. You see alot these days lined with fleece, which I think is wrong. Alpaca is soft enuough, and if anything the fleece should go on the outside. If I used fleece at all there it would be a very light separate layer, for more versatility. I would use the fleece when I need just a little something, then replace with the Alpaca when I need a little more, and the fleece again, but over the Alpaca not under, when I needed a little extra. I think that Alpaca is going to be perfect for sleeping in cold weather, looking forward to trying the head tube for breathing in really cold air.