I have switched over to mostly wool clothing for traveling primarily because of the stink factor, but fire resistance is an added benefit. I've only tried a couple of different brands, but so far I like the Icebreaker brand. It is expensive, which is why I don't have much, but if I'm patient I can find them on sale for about the same price as synthetics. Also, I've read that wool can absorb 30% of it's weight before it actually "feels" wet, whereas some synthetics always feel clammy. I have noticed this before on wool shirts, the shirt will feel dry against the skin, but you can always tell when wool is wet because it gets HEAVY.

I don't know how well we can extrapolate from merino wool clothing to blankets, I'm assuming that it will share many of the same properties.

I forgot to mention that a fleece blanket really works better paired up with some sort of nylon/polyester shell to add some wind/water resistance. Otherwise it blocks wind about as well as a screen door.