Not the best pic, but a nice shot of our cases stacked with (graded) heat on the left and the product straight from the factory on a chilly morning (cases are fogged). For our final product…we ended up with quarter inch Mitsubishi UV resistant acrylic. We place 4 holes for breathability and also found waterproof, breathable vents to go over those holes (think the membrane on an iPhone case that allows Touch ID). In all, this is by far the best preservationalist box on the market – very close, if not, museum quality.