How well does the Zipka perform on a hairless head? Does it stay put or have a tendnecy to slide when the ol' cranium is sweating? It can get pretty sultry at night in Texas... I assume it has some grip-like surface on it?
I use headlamps while night fishing and the current cheapo one I have has the power button in a bad spot. I lost a fish one time trying to hit the switch to turn on the light when I was getting it near the boat. The Zipka looks nice and compact for storage...