I wear one Buff as a helmet liner and another one around my neck and over my face when its cold out. BTW, it's pretty amazing just how well a Buff keeps your face warm, considering how thin it is!
(It's also pretty amazing they can charge twenty bucks for a thin tube of fabric, but I guess I'm a pretty good argument for their pricing strategy: I have 5-6 of these things and use them all the time.)
'12 Moto Guzzi Stelvio NTX
'06 Honda Helix