flak jacket

padded garment which protects the wearer from bullets or shrapnel

A flak jacket or flak vest (or flack jacket)[1] is a form of protective clothing designed to provide protection from shrapnel and other indirect low velocity projectiles. Today it frequently refers to bulletproof vests, particularly Type III and above which have added steel, titanium, ceramic or polyethylene plates which can withstand high-powered rounds such as from rifles.
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