The Ultimate Shield for Cold Water: Shark Stop CORE 5mm Back Zip

Go deeper, stay longer, and dive with total peace of mind. The Shark Stop CORE 5mm Back Zip is our most heavy-duty thermal suit, engineered for those who refuse to compromise on safety in cold-water environments. While the FLEX range focuses on agility, the CORE range is built for maximum coverage, featuring an increased surface area of our shark bite–resistant material throughout the torso and key impact zones.

This is more than a wetsuit, it is a rugged, 5mm cold-water armour designed to keep you warm, buoyant, and protected when you’re miles from shore.

Why the CORE 5mm Back Zip is your ultimate cold-water companion:

• Maximum Coverage Armor: Built with more UHMWPE fiber than our Flex range, strategically focused on the torso and vital areas to provide our highest level of puncture resistance.

• Scientifically Proven: Independently tested on Great White and Tiger Sharks. Our technology is proven to prevent 100% of critical injuries in real-world shark interactions.

• Superior 5mm Thermal Core: Designed for temperatures between 12–18°C, providing heavy-duty insulation for winter swells, deep dives, and long hours in the boat.

• Easy-Entry Back Zip: Features a wide-set entry and an extended pull-cord, making it the easiest suit to get in and out of, even with cold hands.

• Internal Flush Guard: A dedicated neoprene shield sits behind the zipper to block cold water flushing, maintaining your core temperature in demanding conditions.

• Built to Last: Our high-density materials are naturally resistant to abrasions, reef cuts, and foil strikes, ensuring your investment lasts for years of rugged use.

Backed by Science

We don't just promise safety; we provide peer-reviewed proof. Our materials are at the forefront of marine safety innovation:

“Our findings suggest that lightweight bite-resistant materials integrated into traditional wetsuits designs offer a promising [...] approach to reduce injuries, haemorrhaging and tissue loss from the species responsible for most fatal bites globally.” — Clarke et al (2025)

Is the CORE 5mm Back Zip right for you?

• Cold-Water Divers & Surfers seeking the highest level of protection and insulation in temperatures below 18°C.

• Foilers & Kiteboarders in cold climates who want a heavy-duty shield against both sharks and foil-strike injuries.

• Spearfishers working in cold, deep water who require a rugged, puncture-resistant "final line of defense."

• Ocean Professionals who need a reliable, easy-to-don suit for daily commercial work in harsh conditions.

Sizing Guide

Unsure what size to choose? View our size chart

→ Still unsure? Reach out to our team for personalised sizing support. A 5mm suit provides the best protection when the fit is perfectly snug.

Sustainability: Closing the Loop

We’re committed to making our gear last, and keeping materials out of the ocean and landfill. Through our partnership with CircularFlow, we close the loop by transforming wetsuit offcuts and end-of-life suits into new, valuable materials. This ensures our resources stay in use, and out of the environment.

Liability

Wearing a Shark Stop wetsuit will not reduce the likelihood of a shark bite or prevent death by shark bite. 

We encourage people to wear a Shark Stop wetsuit when working in, or enjoying the ocean, in order to reduce the extent of bodily injury caused by shark bite.

The materials used in Shark Stop wetsuits are designed only to reduce the extent of skin and soft tissue penetration caused by shark bite and Shark Stop wetsuits provide no protection from the pressure impact of a shark bite (eg. bruising, crushing and/or breaking of bones and other bodily damage) or from drowning caused by shark bite.

While extensive testing has been performed in the development of the materials used in Shark Stop wetsuits to reduce the degree of bodily injury caused by shark bite, Shark Stop wetsuits must not be considered as a life saving device and Shark Stop accepts no liability for personal injury and/or death resulting from the use of Shark Stop wetsuits.