The invention of carbon fibre, modern hard ceramics and various plastic compounds are suitable for light armour which is effective in many circumstances. Kevlar, Technora and Nomex are Aramids, which are long-chain aromatic polyamides. They are used to make bullet resistant vests and bullet resistant face masks. The PASGT helmet and vest used by United States military forces since the early 1980s both have Kevlar as a main component, as do their replacements. Most of these items have padding on the inside to act as shock-absorbers, and to increase comfort during while being worn.