Step 1 : Introduction to the question "What material is used to make vests bulletproof?"
Kevlar is a well-known component of personal armor such ballistic vests. The bulletproof vests used by United States military forces, police officers, and SWAT use Kevlar as the key component in their construction. Kevlar is a heat-resistant and strong synthetic fiber, developed by Stephanie Kwolek at DuPont in 1965. It is strong enough to stop bullets and knives, and often described as being "five times stronger than steel on an equal weight basis." It has many other uses too, from making boats and bowstrings to reinforcing tires and brake pads.
