The heat is blown out through the shirt, look carefully at the thermograph and you will see a hot spot on the mans neck.
Well, that's what I was implying yeah!
So it requires a special shirt? Damn. And even with this special shirt, blowing hot air "through" the shirt is not going to heat up air INSIDE it at all? A "pocket" is a good insulator?
Sounds a bit bullshitty to me.
And heating the neck is not going to be damn uncomfortable and ruin the attempt at cooling down below it?
That just looks like a stupid implementation of a concept that could kind of work. (Though even if there was no heat issue, just cooling down this spot will make you feel cooler BUT I suspect again that it may feel very annoying/uncomfortable after a while...)
Additionally, if it's indeed a Peltier-based system, those modules eat up so much power that I wonder how long this could last on a small battery...