Big fan of Buffs here; I find them very versatile and useful.

Personal uses include: a neck gaiter when its still cool but I have the motorcycle out, a sleeping mask for camping, a facemask for sub-zero weather, and a simple cap.

I have just the one right now (a plain black Original Buff), but I always have it with me. It folds up nice & is virtually imperceptible in the back pocket of my pants.
_________________________
Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck. Roald Amundsen