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The outer layer was designed to absorb the bullet's energy and the thicker inner layer stopped further penetration.The armor would be left badly dented but still serviceable.While a vest can prevent bullet penetration, the vest and wearer still absorb the bullet's impulse.Even without penetration, heavy bullets deal enough force to cause blunt force trauma under the impact point.



These vests may incorporate coated and laminated para-aramid textiles or metallic components.By contrast, stab vests provide better protection against sharp implements, but are generally less effective against bullets.Textile vests may be augmented with metal (steel or titanium), ceramic or polyethylene plates that provide extra protection to vital areas.Kim Gi-Doo and Gang Yoon found that cotton could protect against bullets if 10 layers of cotton fabric were used.

The vests were used in battle during the United States expedition to Korea, when the US Navy attacked Ganghwa Island in 1871.

The etymology of "bullet" and the adjective form of "proof" in the late 16th century would suggest that the term "bulletproof" originated shortly thereafter.