Review on 🖤 Moldable Foam Clay by Bendt Cosplay: Lightweight & Easy to Shape, EVA-like Density, Simple Sanding & Painting, Non-Toxic - Black, 300g by Kelsey Brown

A good thing, versatile and requires a little patience. It's really thin and soft straight out of the tin but I'm sure you could use it to press it into shape and get the details. In this state it doesn't hold its shape well on its own, but just let it dry a bit and it will progressively stiffen until you have something like EVA foam and can cut it out of there. It's probably a good idea to build around rebar or, like I've done, add organic shapes to the flat sheets of EVA mat.