The question we get asked more than any other is some version of: can a wetsuit actually stop a shark bite? The answer requires a short detour into materials science, because the fabric used in Shark Stop wetsuits was not developed for the ocean at all.
What Is UHMWPE?
Ultra-high molecular weight polyethylene, abbreviated UHMWPE, is a thermoplastic polymer with an extraordinarily long molecular chain. That chain length is what gives the material its remarkable properties: an exceptionally high strength-to-weight ratio, resistance to cutting and abrasion, and very low friction against hard surfaces.
UHMWPE fibres are used in offshore sailing rope, bulletproof vests, surgical sutures, and industrial cut-resistant gloves. In fibre form, it is approximately 15 times stronger than steel by weight. The trademarked version most widely used in protective applications is Dyneema, produced by DSM in the Netherlands.
Crucially for wetsuit applications, UHMWPE fibres are extremely flexible at the individual fibre level. Unlike chainmail or rigid armour plate, a woven UHMWPE layer can move, stretch, and compress without losing structural integrity, making it compatible with neoprene construction and the demands of surfing or diving.
What Happens During a Shark Bite
Shark teeth are serrated and designed to cut through flesh, cartilage, and bone through a combination of penetration force and lateral cutting motion. The biomechanics vary by species: white shark bites involve substantial lateral shaking to slice through large prey items, while tiger shark bites tend to involve more direct crushing force.
When a shark tooth contacts a UHMWPE weave, several things happen simultaneously. The hard tooth surface meets a network of fibres that distribute force laterally across the weave rather than concentrating it at the point of contact. The high tensile strength of individual UHMWPE fibres resists cutting, meaning a tooth that would readily slice standard neoprene must instead work against a surface that resists lateral cutting forces. The low surface friction of the material also allows the tooth to deflect rather than grip.
This is not impenetrability. Under sufficient sustained force, or from a very large animal, a UHMWPE weave can be breached. But the threshold required to do so is substantially higher than for standard neoprene.
What the Independent Testing Confirmed
The 2025 Clarke et al. study published in Wildlife Research , independently funded, with zero manufacturer involvement, tested UHMWPE-based wetsuit materials including Shark Stop against bites from white sharks off South Australia and tiger sharks off Norfolk Island.
The results showed that bite-resistant materials incorporating UHMWPE significantly reduced the frequency of Category 3 (substantial) and Category 4 (critical) bite damage compared to standard neoprene. Critical outcomes, those associated with life-threatening tissue loss and haemorrhaging, were consistently reduced even from sharks exceeding three metres in length.
Professor Charlie Huveneers, co-author of the study and one of Australia's leading shark researchers, confirmed: "they can reduce blood loss and trauma from major lacerations and punctures, potentially saving lives."
The reason that matters so much is the mechanism of death in most fatal shark bites. The overwhelming majority of fatalities are caused by rapid blood loss, not the bite event itself. A material that reduces the severity of lacerations and punctures, and thereby slows blood loss, directly extends the window in which a victim can exit the water and receive medical care.
Can a Wetsuit Protect You From a Shark?
The honest, science-based answer is: a UHMWPE bite-resistant wetsuit can significantly reduce the severity of injuries from a shark bite, particularly the lacerations and punctures that cause life-threatening blood loss in most fatal incidents. It cannot prevent a bite from occurring. It cannot prevent all injury from a very large animal. But it is the only independently tested, peer-reviewed technology available to surfers and divers that demonstrably changes the outcome of an encounter after contact has been made.
That is not a small thing.
Shark Stop wetsuits are built with UHMWPE fibre woven into Yamamoto limestone-based neoprene — performance construction with independently verified protection. Explore the range here.