[jmye]

> I could imagine some kind of warm water tube system that takes heat from a heat exchanger on your chest and transports it to your hands and feet, and is pumped by the action of walking. Not sure if that’s been tried before.

I feel like you just re-invented the circulatory system. I don’t mean that to be snarky at all, just that I think part of the problem with your hands is that your body starts sending them less blood to keep your core warm. I’d think that pumping more heat away from your core would be bad for survival.

But my climbing is also not on vertical rock at 25k+ feet!