What Do The NIJ Protection Levels Mean? | Bulletproof Zone
· The threat levels for ballistic vests are set by the NIJ (National Institute of Justice). There are currently five levels in use - Level IIA, II, IIIA, III, and IV - and each covers a different caliber of bullet. We'll help you understand all the NIJ levels so you can assess which level defeats the range of threats most likely to come your way.