... collar, shoulder ,front & back ,and groin protection. Our bullet proof vest is made of High Tenacity and High Modulus Dyneema (PE) ... performance, what is more, it is lighter (153gsm). An NIJ IIIAbulletproof vest ( Size M ) only needs 35 layers at most. The ... it needs to reach NIJ III Level or NIJ IV Level, it must needto put into NIJ III and NIJ IV Level bulletproof plate. bullet proof vest