Answer: kevlar

AnswerCrossword Clue
KEVLARBulletproof vest material
KEVLARBody armor material
KEVLARProtective apparel fiber
KEVLARFiber used in body armor
KEVLARBody armor fiber
KEVLARDefensive fiber
KEVLARPolice-vest material
KEVLARSynthetic fiber used in bulletproof vests
KEVLARSynthetic fiber used in bicycle tires and bulletproof vests
KEVLARKind of vest