Be VERY VERY VERY careful with a waterproof cover if you are using it outside!!!!! I ruined the paint job on the hood and trunk lid of my all original california born 75 Eldo with a WATERPROOF cover by leaving it outside. While rain does not go through.....condensation does form underneath.....THEN when the sun comes out and beats down on the cover that DOES NOT breath since it is waterPROOF.....the paint actually gets boiled and burned!!!!! Trust me on this one......it was not a good day.....