Spearfishing has always attracted people who take their equipment seriously. The preferences that have developed around wetsuits, two-piece construction, open-cell neoprene, camouflage patterns, didn't emerge arbitrarily. They reflect decades of refinement by divers who spend serious time in the water and have strong reasons for every choice they make.
Shark Stop respects that. But the science of shark vision, and the material science behind bite-resistant construction, raise new and novel 21st century questions worth sitting with.
The Two-Piece Question
Spearfishers gravitate toward two-piece suits for reasons that made sense when the alternatives were basic one-piece steamers with rear zips, flatlock seams, and no integrated hood. Those suits genuinely were less functional; stiffer, colder, and harder to duck dive in.
Shark Stop's CORE and FLEX suits are one-piece, and they share none of those limitations. In the front-zip models, there is no rear zip. Seams are glued and blind-stitched throughout. The 5mm front-zip model includes a built-in hood. The construction addresses the functional objections that historically pushed spearfishers toward two-piece in the first place.
The one genuine difference is the loading pad. For now, Shark Stop suits do not have a chest loading pad for speargun reloading. That is a real omission for spearos, to make the wetsuits suitable for other activities like Ocean Swimming and Surfing, and we are not going to pretend otherwise. For spearfishers who rely on one, a standalone loading pad worn over the top of the wetsuit is a straightforward solution.
Why Open-Cell Isn't Possible in a Bite-Resistant Suit
Open-cell neoprene has a single laminate layer on the outside, with the raw inner surface of the rubber gripping skin directly. That contact is what produces the thermal seal spearfishers depend on for long static dives.
Shark Stop's construction requires bite-resistant textile as laminate on both surfaces, outside and inside the neoprene core. Both layers carry the bite protection. This is not a design preference that could be revisited with a different cut or colourway. It is a structural requirement of the protection itself. Remove the inner laminate and you remove more than half the bite resistance. The two things, unfortunately, cannot coexist in the same suit.
Why Camouflage Doesn't Work on Sharks
Camouflage patterns are engineered for human eyes. They exploit colour contrast and pattern recognition to break up an outline against a given background. The assumption built into every camo design is that the observer has colour vision.
Sharks do not.
Research published in Naturwissenschaften – The Science of Nature by scientists from the University of Western Australia and the University of Queensland examined the retinal photoreceptors of 17 shark species. Every species had only a single cone type, indicating they are cone monochromats, in all likelihood, completely colour blind. A subsequent review in Seminars in Cell and Developmental Biology (Hart, 2020) confirmed this across all shark species studied, noting that sharks appear to have abandoned colour vision independently on multiple occasions through their evolutionary history. Behavioural experiments completed the picture: sharks could not distinguish blue from yellow stimuli when brightness was matched. They perceive contrast, not colour.
Viewed in greyscale, as a shark views it, camouflage collapses. The greens, browns, and earth tones that break up a human outline for a human observer flatten into undifferentiated mid-tones. The pattern that makes visual sense to a diver on the surface does nothing for concealment from the animal they are most concerned about below it.
Why Grey Is More Effective in Blue Water
Shark Stop suits are grey. This is not a branding decision. The UHMWPE fibre that forms the bite-resistant laminate is inherently grey; that colour is a material property, not a dye or finish applied to it. The neoprene panels are matched to the laminate to produce a consistent appearance across the suit.
In open blue water, viewed in the greyscale that represents shark vision, grey sits closer to the ambient tones of the water column than camouflage patterns do. Camo was not designed for blue water. It was designed for terrestrial environments and adapted by an industry catering to human colour perception. In the visual system of the animal a spearfisher is most concerned about, grey in blue water is a more rational choice.
What Shark Stop Wetsuits Are Actually For
Spearfishers are among the ocean users most exposed to shark risk. They are in the water for extended periods, actively attracting sharks with their kill, in conditions where sharks are present. The question of what a wetsuit should do in that environment is not abstract.
Shark Stop wetsuits were designed for that specific moment, not to prevent a shark from approaching, but to reduce the severity of a bite if one occurs. The fabric has been tested by Flinders University on great white sharks at the Neptune Islands, with results showing significant reduction in tooth penetration depth and tearing damage compared to standard neoprene. Tiger shark testing conducted in Queensland in 2024 showed the fabric prevented 100% of critical damage and reduced severe damage by up to 89%.
The construction constraints that make a Shark Stop suit look different from a traditional spearfishing wetsuit are the same properties that make the protection possible. They are not compromises. They are the product.
Whether spearfishers will see this evolution in wetsuits as something worth adopting, or whether camo, two-piece and open-cell are not things that can be substituted, only time will tell.