FRIDGES AND SHIT

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Hey guys, I bought a killer fridge but it's too hot outside. The manufacturer specifications say it's good in ambient temperatures up to 90 degrees, but I'm in Utah and it's in the 90s and 100s for the weather and inside my car is of course much hotter out in the sun. The fridge works great when it's not the hottest part of the day, but when it's 90+ the thing just shits out and keeps turning itself off to stop sucking power from my 12v outlet despite the fridge being set on low battery protection mode. Obviously this isn't working for things which need to remain cool and the temperature reading shows 60s-70s inside the fridge because it stopped cooling with the oven-like temperatures of a sun-baked suburban.
I've read about people insulating fridges like this with different materials but my local Lowe's only seemed to have one type of polystyrene insulation in the isle and I'm not sure that's the best tuff to use and if I use it will it even work. I have the one inch thickness but am thinking about returning it and buying two inch thickness before I cut it and surround all four sides, top, and bottom with this stuff which just looks like styrofoam with a shiny, aluminum side.

>tl;dr
Anybody have experience insulating a 12v fridge for camping and sleeping in your car in hotter weather?