I can't find the article anywhere, but there was a similar idea done a while back where you would wear a 'dome' that was air-conditioned, keeping your head and shoulders cool. It worked wonderfully for keeping you feeling cool and as a result you didn't sweat.

Also as a result, you didn't notice when your body temperature was rising too high, so it did absolutely nothing to prevent heat stroke or any other forms of heat exhaustion. I'd be concerned about this wristband doing roughly the same thing.

I don't think this is something you should be wearing out for a jog, or while you work out in the fields, or similar.

It sounds great for my situation, though, where I'm sitting around programming in Costa Rica. I could turn off the A/C and let the house be its normal temperature of 85 degrees or so.

Like drinking a coffee every day.

There's been a bit of a precedent for that though, so we know how it works.

Heh, a coffee (I find it funny because I'm now at 5-6 mugs per day :-))...