|Basically a kick ass headband that's a tiny bit wider. However... GOOGLE DEFINITION: A Buff is a seamless tubular garment made from a high-performance microfiber. Given its breathable, moisture-wicking qualities, a Buff offers the same performance benefits that we runners demand from other high-tech garments. NICK DEFINITION: A kick ass piece of clothing that you can 1) wear on your head to keep the sweat from dripping in your eyes while you're crushing everyone else in the race, and/or keep the hair out of your eyes, 2) wrap it on your wrist to wipe the sweat from your brow, or 3) use it as a very tight crop top while you're listening to Van Halen. Either way, it's only $12 so save a few dollars by ordering a Michelob Ultra and use those savings to buy this BUFF.