USB necktie with built-in fan keeps you cool

Ain't nothing classier than a clip-on tie...except one with a built-in USB-powered fan in the knot. We're not certain how this thing keep you cool, or why you wouldn't just use any of the million other USB-powered fans that don't increase your dork factor by 1000, but the people in the photos look so blissfully content we're actually a little curious.