Or UHMWPE for short. UHMWPE when it is used for body armor it is created using a process called gel-spinning. This involves drawing dissolved ethylene through a series of small holes. ... IIIA(3A) Light Weight- Only 4.85lbs/ 2.2Kg Top Quality Level 3A NIJ 01.01.04 The best way to estimate the needed size is that the vest you are buying would be ...