Building LARP props & weapons

Starting points for boffer weapons and EVA foam armour — how they are built, and why the safety table, not the tutorial, is what decides whether yours passes.

EveryoneUpdated August 28, 2026

Prop & Weapon Crafting in the LARP Realm collects starting points for building safe, good-looking gear — the shape of a boffer build and a foam armour build, written down so you are not reverse-engineering one from a video at midnight.

The LARP prop and weapon crafting reference, with a numbered boffer weapon build covering core, end caps, thrusting tip, blade foam, skin and flex test, above a foam armour section. — A boffer build, step by step — and the flex test that decides whether it is finished.

Your group's safety standard is the real spec

Every group sets its own weapon-safety standard, and they genuinely differ — tip throughput, pommel checks, minimum foam thickness. Build to your group's standard, and get everything checked at the safety table before you swing it. A weapon that passed somewhere else is not a weapon that passed here.

A boffer weapon, in outline

The reference walks the full build; the shape of it is: a core (fiberglass, or a safer hollow kitespar/graphite rod) cut shorter than the finished blade, both ends capped so the core cannot punch through, a soft open-cell thrusting tip, closed-cell foam or pipe insulation for the blade, and a stretch fabric or latex skin for durability and looks.

Then the part that matters: the flex test. The finished weapon should flex, show no exposed core, and pass your group's tip-throughput and pommel checks.

Foam armour

EVA armour follows the cosplay route: pattern in paper or craft felt first and fit it to your body, trace onto EVA floor mats, cut with a sharp blade, bevel the edges, heat-form the curves with a heat gun in low even passes, then seal the porous foam before painting.

Pattern it digitally first

If you would rather not draft the pattern by hand, the Cosplay Workshop will model a piece to your measurements and unfold it into printable foam templates. The same templates work for LARP armour — just build to your group's safety standard rather than to convention-floor standards.

Before you take it to an event

Put your finished gear on the kit checklist so you do not arrive without it, and read the safety calls so you know how play stops if something goes wrong with it.

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