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Nascar drivers use a similar system, with smaller tubes woven into T shirts, etc..
The whole thing works mo better if/when:
1. Wear WHITE or light colored reflective clothing.
2. Cotton and some other fabrics wick better than synthetics, so are more efficient drawing heat away from the body.
3. A WHITE or at least light colored car absorbs much less sunlight and therefore heat than a dark one, so stays cooler. This is especially true of the interior, since a car and its glass are typically a pretty efficient solar oven, when the interior is black or dark.
4. Latent heat of evaporation means that if some of that cool water were leaked or seeped onto the seat cover or your shirt, it would evaporate and make you much cooler than even now. Some guys on a motorcycle website that I frequent do this with a squeeze bulb to pump a bit of water through plastic tubing onto a T shirt. Works great. el cheapo.
5. Google for "evaporative vest" or similar, and see what road and construction crews use to stay cool in the hot sun. The best of these ~$30 vests would of course be white or light colored. They have chemicals in the cloth that absorb water when immersed in water for a few minutes, then evaporatively cool for hours even in the Mohave desert. Similar techniques used in helmet liners, bandanas, wrist bands, etc.. Safety apparel companies sell this stuff online, for cheap.
6. Somebody mentioned "Polar Mesh" reflective and flow-through motorcycle seat covers to prevent monkey butt. Works, but not cheap. Wood bead seat covers do similar, allowing air to circulate between your back and butt and the seat, and reportedly can be had at WallyWorld pretty cheap. Meanwhile, anybody here know where to get "Polar Mesh" or similar cloth to make seat covers with?
7. A combination of these techniques would work synergistically.
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