Life Fibers

Life Fibers are the material that are used to make fighting suits and Kamuis. They are possibly made from "life force" of slain students. They are used to make Goku Uniforms, with 10%-30% density, depending on how many stars the suit will get. However, the average student will go insane at 50% density. Kamuis are made of 100% Life Fiber. Hōka Inumuta is in charge of analysing the Goku uniforms researched in the Sewing Club.

Banshi
The Banshi is a vital thread of Life Fiber and is present in every Goku Uniform. It is what holds them together, since it is, according to Iori, imbued with the will to become clothing. It is protected by several layers of Life Fibers, making it nearly impossible to be exposed or damaged. If it is removed, the Goku Uniform is destroyed.