5

The mats are common, as you suggest and are composed of EVA foam. Almost every source I've found involves textured surfaces and interlocking edges. This is not universal. Cosplay costume makers use this material for creating various components of costumes, including masks and armor. My brief search returned un-textured foam in 0.25" thickness (6.35 mm) ...


3

A rather natural and realistic looking imitation you can opt for, is real leather that has been made to look like stingray leather. This is bonded leather, and made by pressing leather scraps mixed with a binder, often rubber. This specific imitation is quite hard to find, though. There are also faux leather alternatives (polyurethane and PVC) to this. ...


1

A similar material is used for cheap camping mattresses. It's usually blue. Search for "blue foam camping pad" or "sleeping pad" or "camping mattress" or "yoga mat" etc. Not sure how it compares in terms of price. Make sure you're buying the smooth kind that can be rolled up; there's also a textured kind that folds up ...


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