Ultra Thin Bulletproof T-shirt Vest Concealable Kevlar Body Armor NIJ Level IIIA. This model complies with NIJ Standard-0101.06 for Ballistic Resistance of Body Armor. SAP protects against 9mm Projectile as per NIJ0101.04 Level IIIA / NIJ0101.06 Level IIIA(by NIJ 0101.06 National Institute of Justice, USA).