Understanding hard body armor levels starts with one fact: a level is a short name for a test. It names the rounds a model was tested against, under a named standard, and nothing beyond that. This guide sets out the hard armor levels a U.S. buyer is most likely to meet, what each was tested against, and what to check before relying on one.
The levels come from two NIJ standards that are both in use. NIJ stopped accepting new models for testing under NIJ 0101.06 on 5 January 2024, and the National Institute of Justice (NIJ) anticipates maintaining its 0101.06 Compliant Products List (CPL) through at least the end of calendar year 2029. A 0101.06 level is not expired. New models are tested under NIJ 0101.07, whose levels are defined in NIJ 0123.00.
Understanding hard body armor
Hard armor means rigid plates, as opposed to flexible soft panels. CJTTEC, which administers the NIJ Compliance Testing Program, says NIJ 0101.07 names its levels "HG" for handgun and "RF" for rifle, with "a reduction in soft-armor levels and an additional hard-armor protection level". The rifle rounds in NIJ 0123.00 are tested at 2,400 to 3,250 ft/s, against 1,305 to 1,470 ft/s for the handgun rounds.
Plates are made from steel, ceramic and polyethylene, alone or in combination. The material affects weight, handling and what happens on impact; the level is what the test recorded. For more on materials, read Materials Used in Armor Plates Explained.
Weight and comfort are part of the decision. In our view, the trade-off between protection, weight and wearability is the real choice a buyer makes, and the level only tells you one side of it.
Level III armor basics
Level III is a level of NIJ 0101.06. Its test round is the 7.62mm NATO FMJ (M80), 147 gr, at 2,780 ft/s. That is the only round the 0101.06 Level III test names. To understand what it covers, see What Does Level III Body Armor Protect Against?.
Under 0101.07, the nearest levels are RF1 and RF2. RF1 is tested against three rounds: the 7.62x51mm M80 (149 gr, at 2,780 ft/s), the 7.62x39mm Type 56 MSC (at 2,400 ft/s) and the 5.56mm M193 (56 gr, at 3,250 ft/s). RF2 adds the 5.56mm M855 (61.8 gr, at 3,115 ft/s). NIJ 0123.00 maps some old levels to new ones (RF1 replaces Level III; RF3 replaces Level IV), but a model's listing does not carry over: a model is listed under 0101.07 only once it has been tested to it, and each level is defined by its own test threats.
A Level III test does not include an armor-piercing round. If the assessed threat includes one, look at the levels that do.
What "Level III+" means. "Level III+" is a real industry term, and it is not an NIJ level. No standard defines the plus, so it can mean any number of extra rounds, or none. Our advice: read the product specification for the rounds it names, and ask for the ballistic test reports behind it, from a lab whose report can be validated. Where an NIJ listing is required, the defined level for the 5.56 M855 is RF2.
Exploring Level IV armor
Level IV is the highest rifle level of NIJ 0101.06. Its test round is the .30 caliber M2 armor-piercing (AP) bullet, 166 gr, at 2,880 ft/s. Under 0101.07, the RF3 test threat is the .30-06 M2 AP, 165.7 gr, at 2,880 ft/s. RF3 is the nearest 0101.07 level, but the two are defined in different standards. For more, see What Can Level IV Body Armor Stop?.
A Level IV or RF3 listing says the model passed that test. It does not say the model was tested against other armor-piercing rounds, or against any number of hits beyond the standard's shot pattern. NIJ's Body Armor User Guide says no body armor is bulletproof.
Weight and cost vary by model. We do not rank levels on price or weight: compare the stated weight and the quote for the exact model.
Comparing materials: steel, ceramic and polyethylene
The material of a plate affects how much it weighs, how it must be handled and what happens to the round on impact. Here is what the sources say, and where they stop.
Steel is a dense metal. A 2009 study of steel-panel body armor (Egorov et al.) reports that fragments from a bullet striking hard steel, called spall, can ricochet and injure the wearer's arms, face or neck, and it tests layers mounted in front of the steel to contain them. Our advice: if you are considering steel, ask what fragment layer the plate has and how it was tested.
Ceramic is among the materials the National Research Council credits with reducing the weight of armor for personnel. CJTTEC advises against dropping ceramic plates on hard surfaces, which can cause breaks or cracks that can affect performance.
Polyethylene (UHMWPE) is among the polymer fibers the National Research Council credits with reducing armor weight. NIST has studied how heat in storage and use can reduce the strength of UHMWPE fibers; follow the maker's storage and heat guidance.
We found no NIJ or CJTTEC source that ranks these materials on cost, durability or multi-hit (checked 1 October 2026), so we do not. For a deeper dive, see Are Steel Plates Better Than Ceramic Plates?.
Choosing the right armor for your needs
Selecting armor means balancing the threat, weight and cost. Start from the rounds in your threat assessment and match them to a level whose test names those rounds.
Then check the record for the exact model:
- The standard and level it is listed or tested at: 0101.06, 0101.07, or another standard.
- Where a buyer, policy or funder requires NIJ compliance, the exact model on the CPL for that standard, its status, and the date you read it.
- For a plate, whether it was tested alone or in conjunction with a specific soft armor model. CJTTEC says a plate should be used only with the specific soft armor model it was tested with: together they make an in-conjunction model.
- For anything outside the NIJ program, the standard it was tested to and the lab report behind the claim.
The CPL answers one question: whether a model met NIJ's program. A plate that is not on it is not, by that fact alone, poor; it is judged on its own evidence. What does not hold up is a claim of NIJ compliance the CPL does not support, or a rating with no named standard, lab or report behind it.
In our view, the best armor is the one that will be worn consistently. For guidance on fit, read The Right Way to Fit Body Armor.
Benefits and drawbacks of hard armor
Hard armor is the category tested against rifle rounds, which soft armor levels do not cover. That is its advantage.
The drawbacks are weight, rigidity and handling. In our view these matter most for long wear and for work that needs movement. Weigh them against the threat for the exact model you are considering.
Conclusion
A hard armor level names a test: the standard, the rounds and the velocities. Read the level against the standard that defines it, check the exact model's record and the date you read it, and then weigh weight, material and fit for the person who will wear it.
Sources
- NIJ, Ballistic Resistance of Body Armor, NIJ Standard-0101.06 (PDF) (read 2026-09-29)
- NIJ, Specification for NIJ Ballistic Protection Levels and Associated Test Threats, NIJ Standard 0123.00 (read 2026-09-29)
- NIJ, NIJ Standard 0123.00 (PDF) (read 2026-09-29)
- NIJ, NIJ Standard 0123.00, Addendum 1 (read 2026-09-29)
- NIJ, Ballistic Resistance of Body Armor, NIJ Standard 0101.07 (read 2026-09-29)
- NIJ, Compliant Products List: Ballistic Resistant Body Armor (read 2026-09-29)
- CJTTEC, NIJ Standard 0101.07 Information (read 2026-09-25)
- CJTTEC, New Ballistic-Resistant Body Armor Standard Published (read 2026-10-01)
- CJTTEC, Body Armor FAQs (read 2026-09-25)
- CJTTEC, Body Armor Care and Replacement (read 2026-09-30)
- NIJ, Body Armor User Guide (read 2026-09-29)
- National Research Council, Opportunities in Protection Materials Science and Technology for Future Army Applications (2011) (read 2026-09-30)
- Tsinas et al. (NIST), Effects of Thermal Aging on Molar Mass of Ultra-High Molar Mass Polyethylene Fibers, Polymers (2022) (PMC) (read 2026-09-30)
- Egorov et al., Investigation of Anti-Ricochet Properties of Body Armor with Steel Armor Panels, Techniczne Wyroby Wlokiennicze (2009) (read 2026-09-30)