Skip to main content
All posts
Body Armor Basics

15 Surprising Facts About Bulletproof Vests

Fifteen facts about bulletproof vests, each from the record: silk and steel before Kevlar, the first recorded police save, why NIJ lists vests model by model, what the label date means, and what NIJ does not cover.

ArmorList Editorial·June 6, 2024·7 min read

Surprising facts about bulletproof vests

Bulletproof vests have a longer and odder history than most people expect, and a few things about how they are tested and sold surprise even people who wear them. Each fact below comes from the body that records it: the National Institute of Justice (NIJ), museums, U.S. Army and Air Force history offices, and the Bureau of Justice Assistance (BJA). Where a sentence is our own reading, it says so.

1. No vest is bulletproof, by NIJ's own account

NIJ's article on police body armor says there is no such thing as bulletproof armor; ballistic-resistant armor protects against defined handgun and rifle threats. We use "bulletproof vest" here because it is the name people search for. Under NIJ Standard 0101.07, the handgun levels are HG1 and HG2 and the rifle levels RF1, RF2 and RF3, defined in NIJ 0123.00. To learn more about protection ratings, visit Understanding Body Armor Ratings.

2. A silk vest came long before Kevlar

According to the Royal Armouries listing of a book by its Curator of Firearms, Lisa Traynor, Archduke Franz Ferdinand owned a silk bulletproof vest made by the inventor Casimir Zeglen, but did not wear it on the day he was assassinated in 1914. For a deeper dive, see The History of Bulletproof Vests.

3. The World War II flak vest was steel, and made against fragments

The National Museum of the U.S. Air Force cites a 1942 study that found relatively low-velocity projectiles, such as flak fragments and pieces of aircraft structure, caused 70 percent of bomber crew wounds. The Air Force Medical Service records that twelve body armor suits were delivered for combat testing in March 1943; the museum describes the armor as overlapping squares of 1 mm manganese steel sewn into fabric.

4. Nylon came in the Korean War

The U.S. Army Special Operations Command History Office records that the Army's T-52-1 nylon vest, field tested with front-line troops in Korea in 1952, stopped 75.7 percent of all fragments and 24.4 percent of small-arms projectiles.

5. Kevlar began in a DuPont lab in 1965

Kevlar is a para-aramid fiber that Stephanie Kwolek invented at DuPont in 1965, according to the Science History Institute; the brand now belongs to Arclin. Arclin says Kevlar's tensile strength can be up to 10 times that of steel on an equal weight basis. That describes the fiber, not a finished vest.

6. The standard came before the vest

In 1972, NIJ's predecessor, the National Institute of Law Enforcement and Criminal Justice, published the first performance standard for police body armor. NIJ says that in the early 1970s, with the U.S. Army, it began developing lightweight body armor woven from Kevlar, and field tested it with 15 police departments in 1975 and 1976.

7. The first recorded save came during that field test

NIJ records the first save on 23 December 1975, when a Seattle officer was shot during a robbery, and counts 17 other officers saved during the one-year test. NIJ Journal 280 (November 2018) reports that the IACP/DuPont Kevlar Survivors' Club, founded in 1987, has recognized more than 3,100 officers saved from death or serious injury by wearing body armor.

8. NIJ certifies armor model by model, not company by company

NIJ certifies body armor for law enforcement model by model, and lists compliant models on its Compliant Products List (CPL). A listing covers that model, under a named standard; status can change, so read it with a date. NIJ stopped accepting new 0101.06 models on 5 January 2024, and anticipates maintaining the 0101.06 CPL through at least the end of calendar year 2029.

NIJ is one standard, not the only one. Not being on the CPL is not, by itself, a sign of poor quality: armor tested to another standard, or by an accredited lab, is judged on that evidence.

9. A women's vest is a separate model, and the lab shoots its seam

BJA's Bulletproof Vest Partnership (BVP) FAQ says NIJ's standard treats male and female vests as separate models, even when they use the same layers. When a female model with stitched bust cups is tested, the laboratory is told to place a shot on the seam, the likely weakest point.

10. A vest can stop a bullet and still dent the wearer

Blunt trauma is measured on the armor itself. NIJ 0101.06 sets the maximum backface deformation at 44 mm, and NIJ Standard 0101.07 keeps the 44 mm limit. A stopped bullet still pushes the armor into the body behind it.

11. The date on the label is a warranty

CJTTEC, which administers the Compliance Testing Program for NIJ, says the manufacturer warranties a listed model's ballistic performance for a stated period, and that the warranty is not evaluated by the program. NIJ said in 2012 that age alone does not cause body armor's ballistic resistance to deteriorate; care and maintenance are vital.

CJTTEC's care advice: wipe the panel cover with a damp sponge or soft cloth and cold water, never machine wash, soak or submerge panels, and store armor flat in a dry, shaded place. Guidelines: How to Maintain and Care for Body Armor

12. NIJ has never tested a backpack, or a dog's vest

NIJ's CPL page says NIJ has never tested or certified backpacks, blankets or briefcases. We found no NIJ standard or CPL for canine armor (checked 30 September 2026), and the BVP FAQ says only ballistic and stab body armor on the CPL is eligible for reimbursement, not K9 armor. Canine vests exist for police and military dogs, and are judged on their maker's own test evidence. See Are There Bulletproof Vests for Dogs?

13. Some of the people who wear armor are not police or soldiers

The Committee to Protect Journalists (CPJ) advises journalists to choose a vest according to the expected threat, and warns that in some countries body armor is considered a weapon and civilian use is illegal. In the United States, federal law, 18 U.S.C. § 931, bars anyone convicted of a felony that is a crime of violence from purchasing, owning or possessing body armor, and some states add their own rules. This is general information, not legal advice. More information: Can You Legally Wear Body Armor in Public?

14. Retired armor can be recycled

Fiber Brokers International, a recycler, says on its own site that it renders para-aramid from vests unusable for ballistic protection and sends it to non-ballistic uses such as gloves and brake pads. The Defense Logistics Agency describes reclaiming boron carbide from excess military ESAPI plates. See Can Body Armor Be Recycled?

15. Public price lists exist

Two cooperative purchasing contracts publish body armor price lists for public agencies: NASPO ValuePoint and Sourcewell (#091924). In our analysis of those lists (read 1 October 2026), the median price of a Level IIIA handgun vest line on NASPO ValuePoint was $1,274. A price shows what a buyer was offered, not what a model stops. What Does Body Armor Typically Cost?

What research is working on

Research continues on new materials, such as the nanoarchitected materials Army-funded researchers tested against microscopic projectiles in 2021. That is research, not armor anyone can buy.

Conclusion

The record behind body armor runs from silk and steel to aramid fiber developed alongside a standard and a testing program. In our view, the most useful fact is the plainest: a vest is rated against defined threats, model by model, and its record says which.

To see what a specific model is recorded as tested to, look it up on ArmorList: its product records show the standards a model is recorded as tested to and, for NIJ, its CPL status with the date the list was read.

Sources

ShareLinkedInXEmail
Keep reading
Body Armor Basics
What Is Overlapping Coverage in Body Armor?

What overlapping coverage in body armor means, what NIJ's Personal Armor Fit Assessment checks (sides within 3 inches of the armpit, at least 2 inches of overlap), and how to check it on your own armor.

Body Armor Basics
The Difference Between Tactical and Military Body Armor

Tactical armor is a trade term for armor worn over the uniform in law enforcement and security; military armor is built and tested to Army and DoD requirements. What the sources say about each, what a study of the two found, and how to choose.

Body Armor Basics
What Is a Ballistic Vest Carrier?

A ballistic vest carrier is the garment that holds the armor panels; NIJ says it is generally not ballistic resistant. What a carrier does, the main types, how to choose and care for one, and how to check the panels inside.