I love this facemask/whole head and face cover/ hat/ scarf/ whatever you can think of. Its warm enough for any temps if temps drop I just fold it over and it's doubles up. Highly recommend I use it more then any other facemask by far. Super comfortable what more can you ask for.
I bought this mainly to use as a face covering for skiing, and it works pretty well for mild weather. The main problem I have with it in this capacity is that it stretches out and loses its shape fairly quickly, and then it won't stay on my face. The other issue is that in really cold weather, the moisture in the wool freezes solid, at which point it's useless as a facemask. So, bottom line, this buff is good when the weather is mild, but doesn't quite do the trick when it gets really cold. I'll probably still use it for the many other uses, but I'm looking elsewhere for a cold-weather facemask.