Mt Whitney Zone Forums Trip Reports Hiking with Dogs: Mt. Baden-Powell, December 13 2015

That's a WoolX merino long neck gaiter:
http://www.hikinggeek.com/2015/12/13/gea...-in-one-gaiter/

You may also consider a balaclava.

If I'm hiking, I've been using a buff, since that neck gaiter is pretty thick and I run hot.