I have been using a beaded seat cover in the summer for a couple seasons now. Every summer I have trouble adjusting to the first few 85+ degree days. The seat covers aren't enough in this case so I went a step further and put a portable misting system together. It consists of a plastic coffee can with a windshield washer pump mounted thru a grommet pushing water thru tubing to an aerosol can spray nozzle. I plug it into the cig lighter and use a momentary push button to engage the pump. On the really hot days I put ice in the water too .
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Best tank= 81.23 mpg on 07-01-2008
Longest range= 791 miles on 9.74 gallons
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
Speaking from experience, removal of clothing seems to be the most effective method for staying cool. Although, I imagine that depending on the seat material so your results may vary.