PPSS Group Interview: Robert Kaiser on Slash Protection
Quick answer: PPSS Group, founded in 2009 by Robert Kaiser, makes stab, slash, spike, and bite-resistant body armor certified to the German VPAM standard and offering 100+ joules of impact protection. Their carbon-fiber composite vests are designed for frontline security, law enforcement, and correctional professionals facing edged-weapon threats daily.
Robert Kaiser started studying knife crime in 2007 while running a security operation in the UK and Spain. What he found convinced him that the body armor available to security professionals at the time was not built for the threat they actually faced. That research became PPSS Group. Fifteen years later, Kaiser still demos his own products on camera, including taking a 9mm round while wearing one of their bullet-resistant vests, an experience he describes as painful but survivable by design.
Why edged weapons are a different threat than firearms
Knives and edged weapons get less attention than firearms in protective gear discussions, but they're arguably harder to stop. A pointed spike or shank can defeat soft ballistic panels entirely because the threat mechanics are completely different. Ballistic panels deflect a projectile traveling at speed; a spike or knife applies focused, slow force directly into the panel surface.
Kaiser has written extensively about this distinction, including his article "The Danger of Slashing | Human Anatomy" which focuses specifically on slash injuries to major arteries and blood vessels. A slash across the jugular or carotid artery can cause incapacitation in under a minute. That is not a firearms scenario, and standard ballistic armor does not address it.
The PPSS response is SlashPRO® Slash Resistant Clothing, made from Cut-Tex® PRO, a cut-resistant fabric engineered to protect muscles, tendons, ligaments, and nerves from blade contact. It is designed to be wearable daily, not just in tactical situations.
How did PPSS Group start?
BPZ: Do you recall the moment you realized there was a gap in stab and slash protection for security professionals?
Kaiser: Around 2007, while running security operations in the UK and Spain, I started seeing more individuals carrying knives and a willingness to use them. The average age of people carrying edged weapons was also dropping. I investigated why, and concluded that religious and political extremism, drugs, poverty, social exclusion, and serious mental illness would continue to drive a global increase in knife crime.
Once I understood the threat, I looked at what body armor was available to security professionals at the time. It was not sufficient. That gap became the foundation of PPSS Group, which we established and began developing from that research phase.
What makes the carbon-fiber vest different from polycarbonate?
BPZ: Your carbon-fiber body armor reduces thickness and weight while maintaining spike protection. What drove that development?
Kaiser: The key difference is spike protection. Stopping a knife from penetrating armor is not especially difficult. Stopping a spike, shank, or any other specifically engineered pointed weapon requires deep research, the right raw material, and serious engineering. Carbon fiber gave us the material performance to design armor that passes official spike protection standards set by governments around the world.
The second objective was certified impact protection. Our carbon-fiber armor is now certified to the German VPAM standard and offers over 100 joules of impact protection. That was previously unheard of in this product category. We made the call to replace our established polycarbonate-based armor with the carbon-fiber version even though it was not the cheapest decision, because protection performance matters more than margin.
What would the perfect PPE look like?
BPZ: If cost, materials, and time were not constraints, what would your ideal protective equipment be?
Kaiser: An ultra-thin, I mean 1 to 2mm thin, ultra-covert, ultra-lightweight full-body protective suit. Officers working covertly inside organizations they have infiltrated cannot wear visible body armor; it blows their cover immediately. A suit that offers full protection without any visual signature would let them rely on their skills and personality to de-escalate a situation rather than being pre-judged the moment they walk in.
Does Kaiser ever get hurt in the demo videos?
BPZ: You have been stabbed, slashed, and struck with baseball bats on camera. Was there ever a moment when you were not sure the vest would hold?
Kaiser: I have never doubted a product going into a demo. Every video follows hundreds of internal tests on raw materials, with force increased incrementally each time until I have built complete confidence in the product. That process is how the demos are possible.
The one time I experienced real pain was during the demo for the ultra-thin bullet-resistant vest we produced several years ago. You can see it in that video clearly. A 9mm round at close range transmits significant force even through protection, and body armor's job is not to eliminate pain. Its job is to prevent death and get the officer home. That is the line I draw.
Bulletproof Zone's top PPSS Group picks
1. PPSS Group Covert Stab-Resistant Vest
PPSS Group's next-generation stab-resistant vest uses the carbon-fiber composite that Kaiser describes above. It protects against knife attacks, spike weapons, improvised weapons, and blunt force trauma. Thin and concealable. Designed for frontline professionals who face edged blade attacks regularly and cannot wear overt armor.
2. SlashPRO Turtleneck Jacket
Certified slash-resistant clothing with a high collar that protects the jugular vein and carotid artery -- the arteries most targeted in knife attacks. Field-tested and certified. Relevant for prison and correctional services, law enforcement, homeland security, and private security professionals who work in environments where edged weapons are the primary threat, not firearms.
3. SlashPRO Body Armor Base Layer
Full-arm cut protection using Cut-Tex® PRO. Arms are the most vulnerable part of the body during knife attacks and close-quarter encounters; this base layer addresses that gap. The torso uses breathable fabric for extended wear. Appropriate for security, law enforcement, and corrections officers who need protection across a full shift. Browse Bulletproof Zone's full PPSS Group catalog for current availability.
Frequently Asked Questions
What is PPSS Group and who is Robert Kaiser?
PPSS Group is a UK-based body armor manufacturer founded in 2009 by Robert Kaiser. The company specializes in stab, slash, spike, bite, and cut-resistant protective gear for frontline professionals including law enforcement, correctional officers, and security personnel. Kaiser, the CEO, began researching edged-weapon threats in 2007 while running security operations in the UK and Spain.
How is stab-resistant armor different from bullet-resistant armor?
Ballistic armor is designed to defeat high-velocity projectiles through deformation and energy dispersion. Stab and spike protection requires a fundamentally different construction because a knife or spike applies focused, slow, concentrated force that standard ballistic panels cannot stop. A vest that stops a 9mm round can be penetrated by a sharpened spike using moderate hand force. PPSS Group's carbon-fiber composite is engineered specifically for the spike and slash threat profile.
What is the German VPAM standard that PPSS Group armor is certified to?
VPAM (Vereinigung der Prüfstellen für angriffshemmende Materialien und Konstruktionen) is a German certification body for ballistic and protective materials. PPSS Group's carbon-fiber stab-resistant vests are VPAM-certified and rated for over 100 joules of blunt-force impact protection.
What is Cut-Tex PRO and what does it protect against?
Cut-Tex® PRO is a cut-resistant fabric developed by PPSS Group for their SlashPRO clothing line. It is designed to resist blade contact severe enough to cut muscles, tendons, ligaments, and nerves. It protects against the slashing and cutting injuries that account for a significant portion of edged-weapon attacks on security professionals; it is not rated to stop a full stabbing thrust.
Is PPSS Group body armor available to civilians?
Yes. PPSS Group products stocked at Bulletproof Zone are available for purchase by eligible civilians in states where body armor purchase is legal. Federal law (18 U.S.C. § 931) prohibits possession by anyone convicted of a violent felony. New York and Connecticut restrict civilian body armor purchase most severely. Check our body armor laws by state guide before ordering if you have any legal questions about your jurisdiction.
Does PPSS Group make bulletproof vests?
PPSS Group's primary focus is edged-weapon protection: stab, slash, spike, and bite resistance. They have also produced bullet-resistant vests, including the ultra-thin model Kaiser demonstrates on video, where he takes a 9mm round on camera. Their current catalog at Bulletproof Zone is focused on slash and stab resistance. No body armor is "bulletproof"; the correct term is bullet-resistant.
Why does PPSS Group's CEO film live product demonstrations?
Robert Kaiser films demonstrations to build buyer trust through verifiable performance evidence rather than spec sheets alone. Each demo follows hundreds of internal tests with incrementally increasing force before Kaiser ever goes on camera. He describes the process as the only credible way to prove the product works under real conditions, and notes that the one time he experienced real pain on camera was during a bullet-resistant vest demonstration.
Key takeaways:
- PPSS Group, founded in 2009 by Robert Kaiser, makes stab, slash, spike, and cut-resistant armor certified to the German VPAM standard, offering 100+ joules of impact protection.
- Edged-weapon and spike threats require completely different armor construction than ballistic protection. Standard bullet-resistant panels can be defeated by a focused spike at hand-applied force.
- PPSS Group replaced their polycarbonate armor with carbon-fiber composite to achieve spike protection levels no previous design could reach, accepting higher production costs to improve performance.
- Their SlashPRO line, made from Cut-Tex® PRO fabric, addresses slash injuries to major arteries and blood vessels, a distinct threat from stabbing that standard vests do not cover.
- All PPSS Group products stocked at Bulletproof Zone are available to eligible buyers. Check applicable state laws before ordering.
Disclaimer: This article is for informational purposes only and does not, and is not intended to, constitute legal advice. Body armor laws change frequently at both federal and state levels. Consult a licensed attorney in your jurisdiction before relying on any information presented here. Bulletproof Zone makes no claim that body armor will provide complete protection in any scenario; no body armor is bulletproof. Last verified against published statutes and the NIJ Compliant Products List on May 2026.
Product specifications referenced in this article are based on each manufacturer's stated specifications at time of publication. Bulletproof Zone is a multi-brand retailer; product availability and configurations may change. Verify current product details on the relevant product page before purchase. PPSS Group's VPAM certification and joule ratings should be verified against the manufacturer's current documentation at ppss-group.com before purchase decisions are made.