Protection at a Higher Level®

Know the Difference: Flak Jackets, Kevlar & the Bulletproof Vest

June 5, 2026
3
min read

Body armor is often categorized by many attributes, including function, brand, level of protection or sometimes even materials. So how do you begin your research for the best products? It can get overwhelming in a space where flak jackets, bulletproof vests and Kevlar seem to reign supreme in descriptions and articles. Let’s differentiate between materials, brand names and societal trends within the body armor space.

WHAT IS A KEVLAR VEST?

A Kevlar vest is a type of soft body armor made of Kevlar material primarily worn by first responders. Its purpose is to stop or significantly slow down bullets or other projectiles to protect the wearer’s vital organs.

Kevlar armor pops up in most searches when researching body armor. It may surprise you to know that Kevlar itself is simply the registered trademark for a type of bullet or stab-resistant para-aramid synthetic fiber. Kevlar fabric or fiber was developed at Dupont back in 1965 and has become commonplace in the body armor industry. It’s usually spun into ropes or fabric sheets that can be used on their own or as a component within a composite material. Kevlar has a high tensile strength-to-weight ratio making it five times stronger than steel and thus a great addition to most soft body protection products. It was first used commercially in the 70s as a replacement for steel in car racing tires but eventually found its way into the body armor market. It has since become the most commonly used material in soft body armor.

Kevlar is not a standalone body armor product. You can purchase Kevlar fiber directly from Dupont. However, in the body armor space, Kevlar is more likely to act as a component of a composite protective material. While technically a Kevlar vest isn’t an actual standalone product, Kevlar material is one of several options available that meets the soft body armor requirements NIJ has put in place.

Unlike a material element like Kevlar, flak and flak jackets have a different history and role in the body armor space.

WHAT IS A BULLETPROOF VEST?

Before discussing the role of the bulletproof vest in today’s body armor industry, it’s important to understand that the term itself isn’t accurate. No body armor product on the market can truly be considered ‘bulletproof.’ While body armor manufacturers do their best to anticipate special threats, there will always be a weapon, bullet or circumstance that can lead to bullet penetration. Though commonly known as bulletproof vests, we are referring to bullet-resistant vests per NIJ standards. The idea of a military or police bulletproof vest is to absorb the impact and reduce or stop bullets or shrapnel penetration to the body. Soft bulletproof vests are made of dozens of layers of fibers that act as a barrier to different ammunition and guns. The material within these laminated fibers is often Kevlar. Soft body armor vests act as a first layer of protection and can be paired with trauma plates for additional protection against higher-level threats. For example, every Angel Armor’s RISE Body Armor vest on its own can meet either NIJ Level II or Level IIIA standards. When paired with Truth SNAP rifle plates, the system offers tiered protection up to NIJ Level III.

Bulletproof vests date back to the 1500s among Italian and Roman royalty. By the 1800s the Japanese were creating soft body armor using layers of silk. The US began to spend more time researching soft body armor options in the early 1900s, and the invention of the flak jacket helped lead the way to more advanced threat protection. It was the invention of Kevlar that really propelled the industry forward and led to the creation of the more modern bulletproof vests we see today.

CHOOSING THE BEST OPTION FOR YOUR TEAM WITH ANGEL ARMOR

While not a perfect comparison, Kevlar, flak jackets and bulletproof vests all play a role in the body armor industry. When looking for the right body armor products, consider the threats your team my face. And as always, refer to NIJ to ensure your selection meets the standards needed to offer the highest level of protection.

Angel Armor offers numerous armor packages in a variety of performance tiers, all tested to the NIJ 0101.06 standard and backed by proper CPL certifications. These packages are available in NIJ Level II and Level IIIA threat levels and come in five distinct performance tiers that vary in weight, thickness, and price. The soft armor panels are compatible and interchangeable with all RISE Carriers and can be used in conjunction with Truth SNAP Rifle Plates.

Want to learn more about the RISE Body Armor System?
Reach out to a knowledgeable member of our sales team at sales@angelarmor.com.

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Customer Testimonials

"Angel Armor saved my life during a critical incident."

Our testing was conducted on an NIJ IIIA ballistic door panel insert manufactured by Angel Armor. The panel was field tested on a 2015 Dodge Charger patrol squad car. Weighing just under ten pounds, the panel slipped into the driver's door with relative ease. No additional mounting hardware or brackets were required. None of the inner door panels, handles or inside trim needed to be removed and the panel slipped between the glass side window and the outer door metal. The panel was secured under the trim piece that ran along the top edge of the driver's door. Our fleet technician took approximately 20 minutes to install the panel, but with more familiarity and reputation, I would expect this time to be reduced. The panel rode nicely and did not vibrate or generate any noticeable noise. It did not interfere with normal window and door locking operations. A small handle allowed the panel to be easily removed and theoretically transferred to another vehicle. After removal from the vehicle installation, the panel was tested at the range. Using a wooden frame for support and portability, the panel withstood various .38, .357, .40, and .44 caliber handgun rounds at 20 feet, as well as 12 gauge 00 buck and slug rounds. The panel failed to stop .223 and .308 rounds (which was anticipated.) Considering the rating was IIIA, the panel performed as expected. The panel was not range tested while installed in a vehicle door. Our testing showed that the panel performed as advertised and would be a worthwhile consideration when outfitting future squad cars.

NTOA Member, Wisconsin
Avail® Ballistic Door Panel — NTOA Member Tested

I received the Truth Series trauma plate and put it to the test. The plate stopped all the rounds fired into it at 21 feet away. No rounds penetrated the reverse side shell. Based on the testing, this trauma plate held up to the factory specs and was impressive with the stopping force it demonstrated. I would definitely recommend this product for tactical use.

NTOA Member, Wisconsin
Truth SNAP® Rifle Plates — NTOA Member Tested

I received the Truth Series trauma plate and put it to the test. The plate stopped all the rounds fired into it at 21 feet away. No rounds penetrated the reverse side shell. Based on the testing, this trauma plate held up to the factory specs and was impressive with the stopping force it demonstrated. I would definitely recommend this product for tactical use.

NTOA Member, Wisconsin
Truth SNAP® Rifle Plates — NTOA Member Tested

Level III rifle plates I can wear all the time — no more going to my truck for a Tac vest. I'd HIGHLY recommend the Angel Armor RISE vest with Truth SNAP 308 plates to any of my brothers or sisters.

Deputy Sheriff in Frederick, MD
Verified First Responder
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