I am a serious runner (1200 miles per year) and over the years have collected an assortment of headbands, bandanas, and other items to keep the sweat out of my eyes. I recently discovered the UV Buff, and now this is all that I use for warm weather running. Here is why:
1. The Buff lives up to its promise of wicking moisture effectively, drying quickly, and being very breathable.
2. The fabric is very comfortable and very absorbent.
3. The Buff can be used in different configurations for head and neckwear. For running I use the "pirate hat," which takes just seconds to make if you follow the directions included on the package. What I like is that midway during my run, I can make a new pirate hat in which the perspiration drenched front winds up in the back. (Note: When you make the pirate hat the left side of the Buff becomes your skullcap. Just make sure the dry part is on the left side when you make the pirate hat for the second time).
4. With other fabrics, a "pirate hat" can make your head hot, but not the Buff because it breathes so well.
5. Although you can also make a bandana, note that the Buff does not stretch. I wear a large hat size, and found that the bandana configuration was a bit tight for me.
6. This comes in lots of colorful and interesting patterns that look great with any running outfit.
The Buff has done a great job this summer of keeping my head cool in the sun and stopping sweat from running into my eyes. I bought my Buffs online at Planet Buff, which I found had a much better selection than the sellers on Amazon, and at prices that were equal to or less than the prices on Amazon depending on the style.
Bottom line: If you a a runner you will really like this.
Update July 23, 2011: We have been having a record breaking heatwave in New Jersey where even at sunrise the temperature is in the 80s with very high humidity. I went running for a couple of hours and was drenched after the first mile. But on a 10 mile run the Buff not only kept the sweat out of my eyes (I wear the "pirate hat" so it covers my entire forehead down to my eyebrows), but also kept my head cool. This is definitely the best headwear that I have used so far for running.
Update October 25, 2011: Although cooler Fall weather has arrived in the Northeast, I still run with the Buff to keep sweat out of my eyes. It also helps to keep my head warm on cool Fall nights.