I have been using Halos for years now. I continually give them to friends, and have to buy more. Living in S. Florida, they are a must for riding to keep the sweat out of your eyes and off of your glasses. In the winter then can be pulled down for a light layer over the tips of the ears. You have to try it to find out, well worth the $12 or so of what they cost!
Works as advertised. Fits great under a helmet and keeps sweat out of my eyes. It didn't seem to be any hotter than having nothing there. The rubber strip feels a little weird at first, but no sweat got by it, and I got used to it.
Bought it for playing squash and have used it for mtb riding.
Great on the court. Ended up buying 2 more, and about to buy a couple for my wife.
Riding is a little different. My helmet fits close, so anything added makes it tighter than I like. No headache, but a little uncomfortable. No problem with sweat dripping into eyes.
Thinking of buying a slightly larger helmet as I really like the Halo Headband.
Hot and headache-inducing, this headband has received a lot of good reviews but it doesn't work for me. It doesn't breathe at all and I end up with sweat pouring into my eyes whenever I look down. I prefer the headsweats.