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How Is Bulletproof Clothing Manufactured?

How armor garments are made, from the fiber to the panel to the listing, as NIJ, CJTTEC, NIST and the National Research Council describe it, and where those sources stop.

ArmorList Editorial·July 16, 2024·8 min read

"Bulletproof clothing" is what sellers call garments that carry ballistic panels: soft body armor built into a shirt, a jacket or a vest. NIJ's Body Armor User Guide says no body armor is bulletproof, and NIJ titles its standard Ballistic Resistance of Body Armor: armor is tested to resist defined threats, at a defined level.

This article sets out what NIJ, CJTTEC (which administers the NIJ Compliance Testing Program), NIST, the National Research Council and published research describe about how such armor is made, from the fiber to the finished model, and where those sources stop. Knowing how it is made explains what it can and cannot tell you about a given garment.

The basics of bulletproof clothing

Armor garments carry soft armor: flexible panels. 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".

CJTTEC says concealable armor allows a wearer to have a more traditional look, worn under the uniform. In our view, that is the appeal of armor built into clothing: protection without a visible carrier.

The protection is not set by the garment. It is the level, or the class under another standard, that a test recorded for the exact model. Two garments that look alike can carry different panels. For more on this, you might explore 17 Surprising Facts About Bulletproof Vests.

Understanding the raw materials

Soft armor is built mainly from two fiber families: aramid (Kevlar is a para-aramid fiber that Stephanie Kwolek invented at DuPont in 1965, a brand that now belongs to Arclin; Twaron is Teijin's) and ultra-high-molecular-weight polyethylene (UHMWPE; Dyneema is Avient's trademark, and Spectra is a brand of UHMWPE fiber made by Solstice Advanced Materials). The names identify fiber families, not the quality of a given product. In its 2011 report for the Army, the National Research Council credits ceramics, polymers and polymer fibers with significantly reducing the weight of armor for personnel.

Aramid has been in police body armor since the 1970s. NIJ writes that its predecessor, with the U.S. Army, began a program in the early 1970s to develop lightweight body armor woven from DuPont's Kevlar, and field tested it with 15 urban police departments in 1975. NIJ's Selection and Application Guide to Personal Body Armor describes how such armor works: a handgun bullet is caught in a "web" of very strong fibers that absorb and disperse its energy, and each successive layer absorbs more energy until the bullet is stopped. 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.

UHMWPE is polyethylene whose molecular chains are very long, which is what "ultra-high molecular weight" means. NIST researchers describe it as commonly used in ballistic-resistant body armor because of the strength of its fibers combined with its low density. To understand more about aramid, you can read How Effective Is Kevlar in Body Armor?.

The process of creating the fibers

Neither fiber is spun from a melt like ordinary nylon. The National Research Council's report on high-performance synthetic fibers describes aramid as spun from a liquid crystalline solution and converted to highly oriented fiber by dry jet wet spinning; the first commercial fiber of this kind was Kevlar.

For polyethylene, the same report describes gel spinning: the fiber is drawn to very high draw ratios, and the drawing extends the molecular chains and orients them in the fiber direction, which gives the fiber its high tensile strength and stiffness. Smith and Lemstra described making ultra-high-strength polyethylene filaments by solution spinning and drawing in the Journal of Materials Science in 1980.

The fiber is only the start, and its condition matters. NIJ says heat, moisture, ultraviolet and visible light, detergents, friction and stretching may all contribute to the degradation of fibers used in body armor, and NIST has studied how heat in storage and use can reduce the strength of UHMWPE fibers.

Weaving the fibers into fabric

Fibers become armor as layers. Aramid is typically woven into fabric, as NIJ's account of the first Kevlar vests describes. UHMWPE is used both as fabric and as composites: a 2024 review in Composites Part A covers both forms in ballistic applications, and NIJ's 2001 body armor guide describes Honeywell's Spectra Shield as two unidirectional layers of fiber crossed at 0 and 90 degrees and held in place by a flexible resin.

What the weave or ply does for a given product is not something a buyer can read from the fabric. CJTTEC says the soft armor models on the Compliant Products List (CPL) differ in materials, stitching patterns and other design details unique to each model, and that a change in materials or design normally means submitting the armor as a new model. If you're interested in the variety of materials used in protective gear, check out Materials Used in Armor Plates Explained.

Crafting the ballistic panels

The layers are stacked into a ballistic panel, the part that does the protecting, and the panel is closed in a panel cover. CJTTEC describes the panel cover as an integral part of an armor's design, not a detail that can be swapped freely.

The number of layers and how they are joined are part of each model's design. We found no NIJ or CJTTEC source that sets a layer count, a thickness or a bonding method for a given level (checked 1 October 2026): the level is what the model's test recorded.

In our view, the cover is also the first line of care. Given the factors NIJ lists, follow CJTTEC's guidance to protect armor from moisture, UV light and extreme heat or cold, and the maker's instructions for the exact model.

Assembling the bulletproof clothing

The panels are then fitted into the garment: a shirt, a jacket or a vest, either sewn in or carried in pockets so they can be removed. CJTTEC names stitching patterns among the design details unique to each model. We found no NIJ or CJTTEC source that compares stitching patterns such as box or quilt stitching for flexibility or protection (checked 1 October 2026).

In our view, removable panels make a garment easier to clean and inspect, but adding or swapping panels does not create a new rating. A rating belongs to the model as tested, and CJTTEC says a plate tested in conjunction with (ICW) a specific soft armor model should be used only with that soft armor. For those interested in the different types of carriers for these panels, you might want to explore Exploring Different Types of Plate Carriers.

Testing and certification for safety

NIJ certifies body armor for law enforcement model by model, through its Compliance Testing Program: ballistic armor under NIJ 0101.06 and 0101.07, and stab armor on its own list, under NIJ 0115.00. A maker submits a model for testing, and a model that passes is listed on the CPL, by model, with its level.

Listing is not the end of it. Under Follow-up Inspection and Testing (FIT), the program inspects and samples production after a model is listed. NIJ's BA 9000 is a quality management system standard for body armor manufacturing, applied with ISO 9001; CJTTEC says it covers traceability from raw materials to finished armor by serial and lot number, and NIJ and CJTTEC both say certification can reduce how often a manufacturing location is inspected and its armor tested under FIT.

The CPL answers one question: whether a model met NIJ's program. That matters where a buyer, a policy or a funder requires it, as the Bulletproof Vest Partnership (BVP) does. Not being listed is not, by itself, a sign of poor quality: a garment tested to another standard is judged on that standard and its lab report. On ArmorList, a product record shows the standards the model is recorded as tested to and, for NIJ, its CPL status with the date the list was read. For a deeper understanding of these standards, consider reading Understanding NIJ Body Armor Standards.

Final thoughts on bulletproof clothing manufacturing

The sources describe a chain: fibers spun and drawn so their molecules line up, made into woven or cross-plied layers, stacked into a panel inside a cover, and fitted into a garment, with the model tested as a whole and, in the NIJ program, checked again after listing.

What they do not give is a way to judge a garment from its fabric or its stitching. Check the exact model's record: the standard, the level or class, the date you read it, and the maker's care instructions.

Sources

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