@whitequark
Ah! Today I learned! And I didn't have to Google it myself, he said in sheepish shame...

Still, point holds: it would kind of suck to lose cooling for 5 minutes because you had to tie your shoes.

Anyway, I'm excited about your project. I wanted to do something similar, but for sleeping. EightSleep has a mattress-based system, but somehow a wearable sounded more interesting. You can close-mount thermometers and add other sensors, too.