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Foam would suck up water unfortunately. It'd almost have to be something that was waterproof, dried quickly, and could be stored compactly.


Closed-cell foam is designed to prevent this problem, but at the cost of being stiffer and heavier.

You made a good point, anyway. Foam could absorb water, and air, and get dirty, and smell bad.


If it was low-cost enough, I could imagine it lasting a few months at least! I don't know if hail is a year-round problem or not however




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