Today I did 4.1 in 20 degree (-6.6 C) weather....but at least this time it wasn't windy!
I wore my Buff around my neck, so I could pull it up over my mouth. But occasionally, when I do that, I feel like I'm suffocating, so I need to pull it down and really gulp in some air. (I do that when on the bike, too.) Each time I did, the water vapor I exhaled made the Buff wetter and wetter, so that by the end of my run, when I'd pull the Buff back UP over my mouth, it was like pulling a rigid piece of cardboard up over my face - the Buff was frozen stiff!
2007 Seven ID8 - Bontrager InForm
2003 Klein Palomino - Terry Firefly (?)
2010 Seven Cafe Racer - Bontrager InForm
2008 Cervelo P2C - Adamo Prologue Saddle