Cycling cap works most of the time for me. For really hot/sweaty conditions (like you've got), just a Coolmax headband that you tie to fit your head. Performance used to sell 3-packs of them, but I don't see them now. The trailing tail of the headband seems to direct the sweat down the back of your neck. Some people just sweat profusely, and not much works. I've not had any luck with SweatGutr type sweatbands and Headsweat skull caps are too small for my head.