Working with EVA Foam

EVA foam is the material that made armor crafting accessible to everyone: easy to cut, cheap to replace, light to wear, and capable of finishes most people can’t tell from leather. Prince builds full pieces in it from the same Academy patterns, and this guide collects how his foam builds actually go together.

Watch: a full helmet built start to finish in EVA foam, from the Academy patterns

The material

Prince’s foam builds use 4mm high-density EVA foam (The Foamery’s, in the sponsored builds), chosen for its density and ease of use. It cuts easily, takes heat shaping, and is, in his words, perfect for all kinds of cosplay work and mockups alike.

Working the foam

1. Lay out and cut

   Same as leather: lay the printed patterns onto the foam, trace, and cut the pieces. Foam is far more forgiving to cut than leather, which is part of why it’s the friendlier first material.

2. Heat-seal the surface

   In the EVA breastplate build, both sides of the cut pieces get a pass with a heat gun, which creates a smooth surface and sets up guidelines for carving.

   Watch: Making cosplay armor with EVA foam (heat prep, carving, fluting)

3. Carve the detail, heat-set the shape

   Decorative carving goes into that sealed surface. For fluting (the raised ridge lines), Prince carves a groove on the underside, then heats the piece and presses the flute into shape.

4. Join the seams

   For seams, Prince trialed contact cement (barge) against heat fusion, and heat fusion proved far more effective in the Berserk foam build. For mockup-grade assembly, cheap office brads stabbed through the foam work; double-capped rivets or Chicago screws are the sturdier, wearable option.

   Watch: seams and assembly options, in the Berserk foam build (2:09)

5. Paint and seal

   With the right paint and sealing, foam can look just as epic as leather. The Berserker Hound foam helmet build walks a complete painting stage on a real piece.

   Watch: the painting stage, in How To Make A Foam Helmet From Berserk (13:49)

Common questions

Where to go next

Deciding between materials? Foam or leather? lays out the trade. Using foam to prove fit for a leather build: mockup fit testing.