For my first hike I set off in late August through the berry fields of northwest Montana, on-trail (warm feet!) and then up through alpine country, through sun-struck rock fields. And it was not just the power of suggestion: as my feet warmed, along with the rest of my body, I started to worry, Okay, this is the point where my feet, in these heavy, sturdy boots, begin to bake, on this too-hot day. And yet, they did not; the cooling mechanism kicked in. I don't understand it, but it worked.