I've been using Headsweats for 12 years.

I first used it when riding my bicycle across the USA in 2000.  I had two problems that I was trying to address:
- I was getting sunburned through the holes in my bike helmet, and
- I was getting tired of having sweat drip into my eyes

A web search found the Headsweats folks.  I called up the owner in Cincinnati and his product seemed like exactly what I needed.  I immediately ordered three of them and had them shipped to me mid-tour.  I was absolutely delighted by the performance of these things.  Ever since, I've had no problem whatsoever with either of the above issues.

The Cool-Max sweatband built into the thing is quite effective in absorbing sweat.

While I originally used the "classic" version, I've since upgraded to the "shorty" version.  The classic version sort of had an open back with three floppy pieces that were intended to be tied at the back of your head.  That felt uncomfortable inside my helmet -- so I never tied them.  The problem with the classic version was that when you take the helmet off, the untied floppy things would flop around in the wind -- sometimes flopping over my head and onto my face -- awkward.  The shorty version fixes that drawback, while keeping the same high performance of the original.

I LOVE my Headsweats!