I've bought a few of these, and love them for their versatility.
These are mandatory equipment for any go bag.
Wrapped properly, they're efficient for their intended use, but double them up with a fold or two, and they make a great scarf, motorcycle face mask, or head covering in a pinch.
Just like everything else in the go bag, these have many different uses: clothing, sling for an injury, blood mop, etc.
Get two, you'll be happy you did.

Good price, good material. Single layer, they're nice and cool, wind cuts right through, but doubled up, they make a great cold weather accessory,once you've had one, you'll wonder why you didn't before.