Kevlar is a material formed by combining para-phenylenediamine and terephthaloyl chloride. Aromatic polyamide (aramid) threads are the result. They are further refined, by dissolving the threads and spinning them into regular fibres. When woven, Kevlar® forms a strong and flexible material. Kevlar when combined with layers of resin results in a ‘rigid’ material that is light and has twenty times the strength of steel.