Driving in summer hot sun burns my arms.  Fortunately there is a technological solution.  Window tint.  When I got my Civic back in 2006 the darker the tint the cooler the interior would be so I got dyed 3M limo tint in the back which let in about 5% of visible light.  For the front I applied 65% tint which wouldn’t attract ticket givers. 2016.  Tint technology has advanced.  Now the state of the art window tint is made with nanotechnology to reflect more heat.  3M Crystalline and Spectra Photosync are the best heat reflecting tints you can buy.