This is a brand new 5 piece removable protective lining made of PU (polyurethane) and EVA (Ethylene vinyl acetate). EVA is the best know shock absorber used in host of sporting gear and protective padding. Five section armor contains two shoulders, two elbows and one back piece. Very easy to insert in most jackets that have removable armor pockets. The two elbow and shoulder pieces are hard armor. The back piece is soft foam. All five pieces weigh about 14 oz.