IMPAC ST Trauma Plates are made from multiple layers of high-performance, high pressure Polyethylene fiber. Polyethylene is ten times stronger than steel, yet it thinness and light weight allow IMPAC ST plates to be utilized in a variety of vest platforms for stand-alone Level IIIA protection and upgraded performance against special threats. IMPACT ST plates are covered in rugged 200 denier nylon to provide protection from everyday wear and tear.