Thin, bendable, yet workable - Yoga mats are cheap, and these are great to begin your foamsmithing journey, as they tend to be easy to work with and cheap enough to mess up with!Ģ.ğoam Floor Mats Image credit: Credit: Amazon Now that the basics are out of the way, let’s dive into some of the more known types of EVA foam (and maybe some lesser-known types!) and which ones will work best for your costume or prop.ġ. In armorsmithing, the materials tend to be varied, but one of the mediums of choice that has come out as a fan favorite in cosplay is EVA foam (ethylene-vinyl acetate copolymer foam) due to its cost, ease of use, and lightweight properties. When cosplayers deem a costume in need of armor or prop pieces, the first step is to decide which pieces require which materials. Armor creation for cosplay has cemented itself as a big player in costuming - so much so that it is largely separated in competition as its own category and with its own judging criteria.