I asked in the Road Forum, and got some good suggestions, but none of them ultimately panned out for me. One of them was pretty close, but no dice.

Over the weekend I lost my merino neck gaiter on a hike to Annette Lake. I've been folding it in half, and using it as a wide headband. When it's cold I can pull it down over my ears, and when I start to get warm, I can pull it up a little and expose them, but still keep my head warm. Since the back is open, exposing my head, it vents very well and it's hard to overheat. Plus, being wool, it wicks sweat away from my brow when I climb hills, and the thing keeps me warm even in a downpour.

When I bought mine, a few years ago, they cost $25. Now they're $40. And that means it's a really good time to see what else works for people.

So, what merino wool thing do you use to keep your head and ears warm (but not too warm) while you ride?