I've never been able to find a bulk 1/2" foam that's its own durable finished surface, especially if it needs to be low-friction as well. Have you seen something similar in use in another product? If so I'd try to contact them for their source. I ended up settling for ripstop nylon liner over closed-cell foam.
Neoprene was the closest I ever found to a durable stand-alone foam, but didn't like the high friction surface and texture of it. McMaster has it in thicknesses from 1/8" through 1" with a bunch in between. It's abrasion and weather resistant, and there's an adhesive-backed version, but it's expensive. It's also relatively heavy at 17 lbs per cubic foot. EVA foams are around 2 lbs/cu.ft.
http://www.mcmaster.com/#standard-foam-sheets/=vpzj1b
They also have an 'Abrasion Resistant Fabric Faced Neoprene' but that's only available in 1/4" max. Never have tried that.
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