Look into T Pro armor by Forcefield. This stuff is CE rated to the higher level 2 (which states that only 9Kn can pass throught the armor). Also, the 4 layer shoulder and elbow armor is rated for a 100 jouel impact and only lets 35 j through the armor. Forcefield is about to release its latest back protector that only lets 3.5 Kn through the armor, best rated stuff ANYWHERE.
Take a look on the net. Google CE rated armor. There is a lot to learn on this subject.