kevlar

noun2

1. •
   (Fabric, cordage, etc made of) aramid fiber, an exceptionally strong, light, man-made fibre used to strengthen cables and sheet materials, e.g. in stab-resistant vests.
2. •
   (US, slang) A piece of personal protective equipment made from Kevlar, such as a helmet or a vest.

noun1

1. •
   A brand name for a para-aramid fiber Alternative letter-case form of kevlar.