Well, any running baseball cap will work. They all drying very fast.
Personally, I use Nike running baseball caps with Merino Buff for cold or a fleece beany for colder. Yeah, just putting my insulation on the cap.
As many here know I do also use the baseball cap for clipping my zebralight. Any running baseball caps have the rear velcro closure which fits exactly as a headband of headlights. This combo is very useful especially when you start your journey (no matter what – running/hiking) early in the morning when it’s still dark.

