Steel vests are typically made of steel plates or steel wires. These plates or wires are inserted into the inner part of the vest to protect the user's body from bullets or other potential hazards.
A bulletproof vest is a protective garment typically consisting of one or more layers encased in a durable outer shell, usually made of ballistic nylon or similar material. This outer shell may contain materials such as steel plates, ceramic plates, or ballistic polyethylene. This structure works to reduce the impact of bullets or other types of ammunition, thus protecting the body against impacts and penetrations.