A recumbent bicycle. Really. I went bent because of arthritis in my hands, but an unexpected advantage has been that the slightly-leaning-back head position means that most of the sweat runs backward. In addition, I get more air flow on my chest and face, helping me keep not-so-hot.

In hot weather, I still have to grab a sweat band when I stop, and occasionally on a slow uphill in the sun. Before the bent, I made terry pads for the front of my helmet. Don't need them now.

Edward