Originally Posted by
Triode
Haven't tried the Gutr, but have the Halo.
for cycling, the skullcap wins hands down, IMO - assuming you wear a helmet.
http://www.headsweats.com/products/Skullcap.html
works a lot better than you might think. Evaporation helps keep you cool. Works great under a helmet.
It is even better if you wet it with a little water after a break if it has dried out a bit.
I have a classic headsweats and I love it. I sweat soooooo much and the headsweats makes it so the top of my head stays dry. Can't complain there. It really does get ride of so much sweat. I feel the difference when I'm not wearing it. (does look silly, but once you put the helmet on, it's perhaps 50% less silly lol)