Foam pauldron

A beginner-friendly guide to drafting and building a set of overlapping foam shoulder plates for cosplay armour.

A foam pauldron is a set of curved plates that sit over the shoulder and upper arm, layered so the pieces overlap like fish scales or roof tiles. The overlapping arrangement lets your arm move while still giving full coverage, which is why this shape appears on knights, sci-fi soldiers, fantasy warriors, and many other armoured characters. Because the basic dome-and-lame structure is so universal, you can draft your own template from measurements taken directly off your body rather than relying on a bought pattern. To draft the main dome, you measure the widest point of your shoulder and sketch a rounded shape on paper that is wide enough to clear that measurement with a little ease. A single large plate covers the top, and a series of progressively narrower strips, called lames, hang below it on one or both sides. Each lame overlaps the one beneath it by roughly a finger's width, though the exact amount is your choice based on how much movement you want. Trace, cut, and test each piece in cheap craft foam before committing to thicker build foam, adjusting the curve and width until the assembly sits comfortably without riding up toward your ear or sliding down your bicep. Heat-forming is what turns a flat foam piece into a plate that cups naturally over a rounded shoulder. A heat gun warms the foam until it becomes pliable, at which point you press it over a rounded form such as a ball or an upturned bowl. Hold the piece in place while it cools and it will keep that curve. The dome plate needs more pronounced shaping than the lames, which are narrower and often need only a gentle curve. Layering contact cement between the lame and a backing strip of thinner foam gives each plate a clean finished edge while also providing an anchor point for the elastic or ribbon that connects the lames together in a stack. Attaching the finished pauldron to your body usually involves a combination of a shoulder strap, a chest-to-back strap. Elastic keeps the stack of lames from splaying apart while still allowing movement. Test the full assembly by swinging your arm in a wide circle and reaching across your chest; if any plate digs into your neck or catches on your sleeve, trim or re-angle that piece before you seal and paint. Safety matters at every stage of this build. Use a heat gun in a well-ventilated space, keep the nozzle moving so you do not scorch the foam, and protect your hands with heat-resistant gloves because the foam and any nearby metal tools can hold heat longer than expected. Contact cement and many foam sealers release fumes, so work outdoors or near an open window and wear a respirator rated for organic vapours rather than a basic dust mask. Younger makers should work alongside an experienced adult when using heat tools or solvent-based adhesives. If you plan to wear this pauldron at a LARP event, check the game's own safety rules and pre-event armour inspection process, because standards for hard and semi-rigid armour vary between different games and organisers.