"What the he!! is a "buff"??"
World is rapidly changing for us old people, hard to keep up : )
"Buff (English /ˈbʌf/, Catalan: [ˈbuf], Spanish: [ˈbuf]) is the registered trade mark for the multifunctional headwear produced by Original Buff S.A., a company based in Igualada, near Barcelona in Catalonia, Spain, since they were established in 1992.
Developed by Joan Rojas in 1991 for wind protection while motorcycling, the Buff headwear is a tube of microfibrous fabric that, with different arrangements, can be worn as a scarf, bandanna, headband, beanie, face mask, tube top, helmet liner, wristband, cap, pirate, Sahara style and other variations. The manufacturing process takes place on a specially developed tubular loom to make the finished garment seamless."
But you could just make one with fabric and put in a seam. Basically just a neck gaitor, except imaginitive people find different ways to wear them that can be more fashion than funtion.