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I'm eager to hear how the seat Daox has bought works out.
I'd like one that gets its air from a tube connected to your lower footwell air vent in the car... then there's no extra drag on the alternator from the additional 12v device.
The pricipal appears to be a supportive matrix inside the cover to keep it from collapsing, but will allow airflow... some kind of stiff batting or beads would work. The backing material is solid and airtight like vynil, the front material that faces your back is perforated or a loose weave. Air is fed iin from a remote spot and it escapes onto your back.
I think I want to make one of these now.
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