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We do 6 and 12 hour endurance races at Ebisu and for the races in summer I will never go back to not using a cool shirt!
In the fully stripped, race prepped S2000 we race I have no hesitation strapping the home made cooler box to the floor (definitely make your own box - fish tank pump and connectors are really all you need). It is heaven to get in at a driver change and hook up to the system, instant coolness over your whole upper body. Without it I would struggle to concentrate for a 2 hour stint in the car and with crazy stripped down civics all over the place being driven by amateur kids its worth being able to focus.
Although we make our own box, we do use proper shirts as making those would be a pain...
However unless you are doing long stretches of time on the track its not worth the extra hassle to run these shirts.
On a hot day I might consider it for a full day track event, but I would make sure the box seals perfectly before putting it in my nice clean interior.
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