Skip to main content
All posts
Ballistic Science & Materials

The Difference Between Ballistic and Stab-Resistant Armor

Ballistic and stab-resistant armor are tested to different standards and listed on separate lists. What each one is rated against, when you need one, the other or both, and how to check a model.

ArmorList Editorial·March 29, 2025·8 min read

Whether you're in law enforcement, private security, or simply someone looking into personal protection, it helps to know that body armor is rated against specific threats. This article sets out the difference between ballistic and stab-resistant armor, so you can match what you buy to what you face.

The research on body armor in general is worth knowing. In a study funded by the National Institute of Justice (NIJ), Liu and Taylor (2017) analyzed FBI data on officers assaulted with firearms or cutting instruments and killed or severely injured from 2002 to 2011, and found that among the 637 officers shot in the torso, those wearing body armor were 76 percent less likely to be killed than those without it. That figure is about gunshots; it does not measure stab protection.

Body armor isn't a one-size-fits-all solution. Each type is tested against particular threats, and knowing these distinctions matters when you choose.

In our view, choosing the right armor is not just about the rating; it's also about comfort, fit, and whether it will actually be worn. Let's look at the two kinds of body armor.

Understanding Body Armor Basics

Body armor is rated against the threats named in the standard it was tested to. NIJ certifies body armor for law enforcement model by model: ballistic armor under NIJ 0101.06 and 0101.07, and stab armor on its own list, under NIJ 0115.00.

There are two broad types of ballistic armor: soft and hard. CJTTEC, which administers the NIJ Compliance Testing Program, says NIJ 0101.07 names its levels "HG" for handgun and "RF" for rifle, "a reduction in soft-armor levels and an additional hard-armor protection level". Soft armor is made from fiber families such as aramids, sold under trademarks such as Kevlar and Twaron, and ultra-high-molecular-weight polyethylene (UHMWPE), sold under trademarks such as Dyneema; hard armor adds a rigid plate, made of ceramic, steel or polyethylene, alone or in combination. In our view, soft armor is the one worn under clothing all shift, and hard armor trades weight and bulk for rifle-level testing.

For more detailed insights into the materials, you can explore Materials Used in Armor Plates Explained.

Key Differences Between Ballistic and Stab-Resistant Armor

Ballistic armor is tested against bullets. NIJ describes soft body armor as working by catching the bullet in a web of very strong fibers that absorb and disperse its energy. Under NIJ 0101.07, the levels are HG1 and HG2 for handgun rounds and RF1, RF2 and RF3 for rifle rounds, each defined in NIJ 0123.00 by the rounds it names; 0101.06 uses its own levels (IIA, II, IIIA, III and IV). A level tells you which rounds the model was tested against, not a general "higher is better" scale for every threat.

For a deeper dive into body armor ratings, visit Understanding Body Armor Ratings.

Stab-resistant armor is tested against blades and spikes. NIJ Standard 0115.00, Stab Resistance of Personal Body Armor (September 2000), sets minimum performance requirements for armor that protects the torso against stab threats, and its scope is limited to stab resistance: it does not address ballistic threats. It has two classes: an edged blade class, which NIJ describes as the threats police officers face on the street, from high-quality, commercially made knives, and a spike class, the threats it expects in a corrections environment, from lower-quality knife blades and improvised spikes. Each class has three protection levels, tested at rising strike energies. The UK Home Office Body Armour Standard sets its own knife-resistance (KR) and spike-resistance (SP) levels, such as KR1 and SP1, alongside its ballistic levels in one document.

Ballistic rating is not stab rating. A vest listed on the ballistic CPL at a handgun level is not stab-rated unless that model was also tested to a stab standard. NIJ lists stab-resistant models on their own list. The UK's National Protective Security Authority says the same: bullet-resistant body armour will not necessarily defeat a knife or a spike.

When to Choose Ballistic Protection

If your primary concern is firearms, ballistic protection is the category tested for it. In our view, that covers roles where gun threats are part of the threat assessment, such as police officers, military personnel and armed security.

Ballistic armor comes in different levels, each tested against specific rounds. Match the rounds in your threat assessment to a level whose test names those rounds. For instance, if rifles are a concern, you need a rifle level (RF1, RF2 or RF3 under 0101.07, or III or IV under 0101.06); handgun levels do not include rifle rounds.

To learn more about the specifics of different armor levels, check out Breaking Down Hard Body Armor Levels.

When to Opt for Stab-Resistant Armor

Stab-resistant armor is the category tested against knives and other bladed or pointed weapons. In our view, it fits correctional officers, security personnel where edged weapons are part of the threat assessment, and anyone whose main concern is a blade rather than a firearm.

NIJ wrote the spike class of 0115.00 around the threats it expects in a corrections environment, where improvised weapons are the concern. Not all stab-resistant armor carries the same rating: check which class (edged blade, spike, or both) and which level the model is listed for, with the date you read it.

For additional information on how body armor can protect against knives, visit Can Body Armor Protect Against Knives?.

Dual Protection Options for Comprehensive Safety

For those facing both firearm and knife threats, there is combination armor, tested for both ballistic and stab resistance. CJTTEC states that NIJ has no separate standard for combination armor: the models on its combination armor list went through full testing in both the ballistic and the stab Compliance Testing Programs and received a separate Notice of Compliance for each.

In our view, combination armor can be heavier and bulkier than single-purpose armor, so weigh the added coverage against what can be worn all shift, and compare the maker's stated weight for the exact model. Ensure each rating, ballistic and stab, is checked against its own standard and its own list.

Importance of Choosing the Right Size and Fit

Fit matters as much as the rating. The Bureau of Justice Assistance (BJA) requires armor bought through its Bulletproof Vest Partnership (BVP) to be "uniquely fitted": vests that conform to the individual wearer through a combination of correctly sized panels and carrier, determined through appropriate measurement, and properly adjusted straps, harnesses, fasteners, flaps or other adjustable features.

ASTM E3003, the standard practice for body armor wearer measurement and fitting, sets out how to measure a wearer. Our advice: measure to the maker's size chart for the exact model, and try the armor on.

For guidance on proper fitting, refer to The Right Way to Fit Body Armor.

Considerations for Color and Concealment

In our view, color and concealability matter for how armor is worn, not for what it stops. For professionals who need a low profile, such as plainclothes officers or private investigators, a concealable vest under clothing or a carrier that matches the uniform keeps the armor out of sight.

For others, such as event security, being visible can be the point. Choose based on your environment and role.

Special Considerations for Women

Body armor isn't one-size-fits-all, especially for women. The BVP FAQ notes that many armor panels are designed specifically for female officers, that some manufacturers also offer carriers designed for them, and that the NIJ standard treats male and female vests as separate models. NIOSH research found that more women than men reported poor armor fit.

ASTM E3003 sets separate minimum measurements for female wearers. Our advice: when selecting armor, check whether the exact model was designed and listed as a female model, and always try it on before purchasing.

Comfort and Wearability Features

Comfort matters because armor is often worn for long periods. NIJ has funded research on how armor affects officers' core body temperature. Makers describe features such as breathable carriers and adjustable straps; compare them for the exact model.

When choosing armor, consider how long you'll need to wear it and in what conditions, and whether the weight is manageable for you. In our view, comfortable armor is more likely to be worn consistently, and armor that is not worn protects no one.

Conclusion

Choosing between ballistic and stab-resistant armor starts from the threats you are most likely to face. A ballistic rating is not a stab rating, and a stab rating is not a ballistic one: check each against its own standard and its own list, or look at combination armor. Then make sure it fits and that you will wear it.

Sources

ShareLinkedInXEmail
Keep reading
Ballistic Science & Materials
Steel vs. Ceramic Body Armor: Which Offers Better Tactical Protection?

The key differences between steel and ceramic armor plates for tactical use: what NIJ, CJTTEC and published research say about weight, handling and fragments, what no source ranks, and what to check on the exact model.

Ballistic Science & Materials
Breaking Down Ballistic Armor: How Aramid, Polyethylene, and Ceramics Stop Bullets

Aramid, UHMWPE and ceramics in body armor: what NIJ, NIST, the National Research Council and the fiber makers say about each, how they are combined, and why the level belongs to the tested model.

Ballistic Science & Materials
Kevlar vs. Dyneema vs. UHMWPE: What the Sources Say About Each Fiber

Kevlar, Dyneema and UHMWPE compared on what the makers, NIST and NIJ say about strength for weight, heat, moisture and construction, what no source ranks, and what to check on the exact model.