AIM but a good budget option would be a Z fold camping mat.

Needs to be green or camo and cost allot of money with a "shooting" related name or you wont hit the intended target.
I've tried self inflating insulated camping bed, but groupings opened up, spent £100 on a range mat and its improved my shooting no end.
I think it depends on whether your buying for yourself or everyone that see's you on the range.![]()
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The carpet tile sure isn'tI use the ulfhednar mat. Very pleased with it overall. Not sure I would call it 100% waterproof though. But certainly water resistant.
I think that boat sailed...Have you patented it yet?![]()
My issue wasn't soaking up from below, but soaking in when the rain came on. As far as I can see, only really the ESE that looks to be made of a material that would be completely waterproof.