The IMPAC ST is 100% Polyethylene, and ten times stronger than steel yet comfortable enough for every day use. Ultra light weight, and composed of multiple layers of high-performance, high pressure polyethylene fiber material Exceeds NIL 0108.01 Threat Level IIIA Standard - Stand Alone Independently tested to defeat special threat rounds beyond NIJ Level IIIA Traps the round - eliminating spalling and fragmentation typically found in hard armor plates utilizing stainless steel, titanium, or other alloy materials Plate is covered in rugged 200 denier nylon to provide protection from everyday wear and tear Single 18 degree curvature, which follows the body's contour Details: Size: 5" x 8" Thinness .27inches Weight 4.5oz Size: 7" x 9" Thinness .27inches Weight 8.0oz Size: 10" x 12" Thinness .27inches Weight 13.0oz