The Sharpest Suit in the Ocean: What Great White Shark Skin Has Taught Engineers

29 June 2026 | White Shark Ocean

Run your hand along a great white shark from head to tail and the skin feels smooth. Run it the other way and it will take the skin off your palm. That sensation — the catch, the resistance, the roughness in one direction only — is the result of a surface that is not really skin at all. It is teeth.

Every square centimetre of a great white shark's body is covered in structures called dermal denticles: tiny, tooth-shaped scales between 0.2 and 0.5 millimetres in size, each one built from the same biological materials as the teeth in the shark's jaw — an enamel-like outer layer, a dentine core, a pulp cavity. Sharks are not just covered in scales. They are covered in a surface of interlocking miniature teeth, precisely shaped and precisely arranged, that has taken evolution hundreds of millions of years to optimise.

Engineers have spent the last few decades trying to copy it. They are still catching up.

What the Denticles Actually Do

Each dermal denticle is not smooth. Its surface is covered in microscopic ridges called riblets, running lengthwise along the body. When water flows over the shark, these riblets do something counterintuitive: instead of creating resistance, they organise the turbulent boundary layer — the chaotic layer of water immediately next to the skin that generates the most drag — into controlled micro-vortices that reduce friction.

Research published in the journal Integrative and Comparative Biology found that dermal denticles reduce drag by between 6 and 18%, depending on swimming speed. What makes this particularly remarkable is how the denticle geometry varies across the body. The taller central riblets on each denticle are optimised for efficient cruising — the long, sustained swimming a great white uses during migration. The lower side riblets engage during high-speed bursts, managing turbulence at the velocities reached during a hunting strike.

The same structure performs two different fluid-dynamic functions depending on the speed at which it is being used. It is a passive, chemical-free, maintenance-free system that has been fine-tuned across 450 million years of evolutionary pressure, and it works across the full speed range of one of the ocean's fastest apex predators.

Under an electron microscope, it looks nothing like biological tissue. It looks like something a very good engineer designed over a very long time.

The Swimsuit That Got Banned

In 2008, Speedo released the LZR Racer — a full-body competition swimsuit developed in collaboration with NASA engineers that incorporated a woven fabric textured to mimic the riblet pattern of shark dermal denticles. The results were, by any measure, extraordinary.

At the Beijing Olympics, 94% of all swimming races were won by athletes wearing the LZR Racer. 23 of 25 world records broken at those Games fell in the suit. Michael Phelps won seven of his eight gold medals wearing it. At the 2009 World Championships in Rome, 43 world records were shattered as competing manufacturers released their own versions.

In 2010, FINA — the international swimming federation — banned the suits entirely. The LZR Racer became the only swimsuit in Olympic history to be prohibited from competition on the grounds that it provided an unfair technological advantage. The shark-skin principle worked so well that the governing body of the sport decided it was incompatible with fair competition.

Some of the world records set in that era still stand today.

Aircraft, Wind Turbines, and Ship Hulls

The drag reduction properties of shark skin have attracted significant interest from industries where friction costs money at industrial scale.

The Fraunhofer Institute in Germany developed an aircraft coating modelled on the riblet geometry of shark denticles. Applied across an entire commercial aircraft, the coating reduces aerodynamic drag and fuel consumption. Researchers estimated that if the coating were applied to every commercial aircraft in the world, the global aviation industry could save approximately 4.48 million tonnes of fuel per year — a reduction in carbon emissions that would be measurable at a planetary level, derived from the skin pattern of a fish.

The same riblet geometry is being applied to wind turbine blades, where it reduces both drag and acoustic noise, allowing turbines to generate power more efficiently at lower wind speeds. Ship hull coatings based on denticle geometry are being trialled as alternatives to toxic anti-fouling paints, using surface texture rather than chemicals to prevent barnacle and algae attachment.

The principle in each case is the same: precise surface geometry, rather than chemical treatment or additional mechanical systems, changes the behaviour of fluid flowing across it. The shark has been doing this since before the dinosaurs existed.

The Hospital Discovery

Perhaps the least expected application came from medicine.

Researchers studying the micro-geometry of shark denticles noticed that bacteria struggle to colonise the surface — not because of any chemical property of the skin, but because of the physical texture. The spacing and shape of the denticle ridges creates mechanical stress on bacterial cell membranes when they attempt to adhere, disrupting their structure and inhibiting their ability to form colonies.

A company called Sharklet Technologies developed a surface material that replicates this micropattern and has been trialled in hospital environments. The results published in peer-reviewed research showed a 94% reduction in MRSA bacteria compared to smooth surfaces, and a 97% reduction in MSSA transmission compared to copper — which is already one of the most effective antimicrobial materials used in clinical settings. No antibiotics. No chemicals. No coatings that degrade or require replacement. Just the geometry of a pattern that sharks evolved to keep their own skin clean.

At a time when antibiotic-resistant bacteria represent one of the most serious public health threats in medicine, the surface of a great white shark is pointing toward a solution.

What We Still Can't Copy

The honest version of this story is that engineers have been learning from shark skin for decades and are still nowhere close to replicating it fully.

The real denticle system is not static. Research published in 2024 confirmed that denticle geometry varies not just by location on the body but dynamically with swimming speed — the riblet configuration across different regions engages differently as the shark accelerates or decelerates. The skin flexes, the denticles shift relative to one another, and the system reconfigures its fluid dynamics in real time. Manufacturing a static surface that mimics one configuration of one region of one shark at one speed is a significant engineering achievement. Manufacturing something that does what the whole system does is a different problem entirely.

There is also the anti-fouling story. The denticles on a live shark don't just resist bacteria mechanically. They are maintained, shed, and replaced continuously — the skin renews itself the same way the teeth do. Engineers are trying to replicate the output of a living system with static materials. The gap between the two is the measure of how far ahead evolution still is.

Why This Matters

Great white sharks are often discussed in terms of what they take — the top of the food chain, the apex predator, the animal that has unsettled human beings since we first entered the ocean. The skin story is a reminder of what they give, simply by existing and being studied.

A swimsuit that rewrote swimming records. An aircraft coating that could measurably reduce global aviation emissions. A hospital surface that outperforms copper against MRSA. All of it derived from an animal whose skin, looked at under a microscope, turns out to be a masterpiece of passive engineering that we are still working to understand.

The great white shark has been in the ocean for approximately 16 million years. Its denticle geometry has been optimising for longer than that. Every engineer who has tried to copy it has come away with the same conclusion: we got part of it. The shark has the rest.

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White Shark Ocean operates cage diving and surface encounters in Mossel Bay, giving you the chance to see these remarkable animals in the water they were built for. Book at whitesharkocean.com.

Frequently Asked Questions

What are dermal denticles on a great white shark?

Dermal denticles are tiny tooth-shaped scales covering the entire surface of a great white shark's skin. Between 0.2 and 0.5 millimetres in size, they are built from the same biological materials as the shark's oral teeth — an enamel-like outer layer, dentine, and a pulp cavity. Each denticle's surface features microscopic ridges called riblets that channel water flow to reduce drag. The result is a surface that feels smooth when stroked in one direction and deeply abrasive in the other, because you are running your hand against thousands of tiny teeth.

How much does shark skin reduce drag?

Research published in Integrative and Comparative Biology found that dermal denticles reduce drag by between 6 and 18%, depending on swimming speed. The geometry of the denticles is not uniform across the body — different riblet configurations perform differently at cruising speeds versus high-speed hunting bursts, allowing the same surface to optimise drag reduction across the shark's full speed range. A 2024 study confirmed that the denticle system also responds dynamically to changes in swimming speed, making it a reconfigurable system rather than a fixed one.

Why was the Speedo LZR Racer banned?

The Speedo LZR Racer, developed with NASA engineers and modelled partly on shark denticle geometry, was banned by FINA — the international swimming federation — from January 2010. The ban followed the 2008 Beijing Olympics, where 94% of swimming races were won in the suit and 23 of 25 world records were broken, and the 2009 World Championships in Rome, where 43 world records fell. FINA ruled that the technological advantage provided by the suit was incompatible with fair competition. The LZR Racer remains the only swimsuit ever banned from Olympic competition.

How is shark skin being used in hospitals?

A company called Sharklet Technologies developed a surface material that replicates the micropattern geometry of shark dermal denticles. When bacteria attempt to colonise the surface, the physical texture creates mechanical stress on their cell membranes, disrupting adhesion without the use of any chemical agents. Peer-reviewed research found the Sharklet surface reduced MRSA bacteria by 94% compared to smooth surfaces and reduced MSSA transmission by 97% compared to copper. The technology is being developed for hospital surfaces and medical devices as a chemical-free antimicrobial solution.

Can engineers fully replicate shark skin?

Not yet. Current engineering applications have successfully replicated specific aspects of the denticle geometry — the riblet pattern, the drag reduction at particular speeds, the anti-fouling properties. But the full shark skin system is far more complex: denticle geometry varies across the body, the configuration changes dynamically with swimming speed, and the skin continuously renews itself as denticles are shed and replaced. Engineers have captured enough of the system to produce meaningful real-world applications in swimwear, aircraft coatings, wind turbines, and hospital surfaces. Replicating the whole system — the dynamic, self-renewing, speed-responsive version — remains an open engineering challenge.