I use 2 Halos. Start with one, then stop after it gets soaked and use the fresh one.
I used to try a Halo with a HeadSweats scullcap, but the scullcap didn't allow airflow,
so I sweat even more.
There is no perfect solution, and I'm in Florida, so I know a little about sweating.
I'd even go so far as using a fresh Halo every 10 or 15 miles.
You can wring them out, but nothing's as good as a fresh one.
Good luck!
S