ONEILL HEAT NINJA 5/4MM SPLIT TOE BOOT | SURF NEOPRENE BOOTS

O'Neill Heat Ninja 5/4mm ST: the neoprene boots for cold-water surfing without losing sensitivity

When water temperatures drop, your feet are the first to suffer. The O'Neill Heat Ninja 5/4mm ST boots are designed for exactly that: keeping you warm in the harshest conditions without sacrificing board feel, thanks to a split-toe design and high-performance neoprene.

WHY THESE NEOPRENE BOOTS MAKE THE DIFFERENCE

O'Neill's Ninja line is built for surfers who don't want to give up winter sessions due to cold feet. The FluidFlex thermal lining retains body heat without adding stiffness, and the split-toe cut separates the big toe from the rest, replicating the feeling of being barefoot on the board. The result is a boot that protects without disconnecting you from the water.

TECHNICAL FEATURES

• 5/4mm thickness: 5mm neoprene on the shaft and 4mm on the foot area, designed for cold water.
• FluidFlex lining: interior material that provides warmth and flexibility without losing fit.
• Split Toe: separates the big toe to improve grip and sensitivity on the board.
• GBS seams (Glued and Blind Stitched): glued and blind-stitched seams that seal the neoprene and reduce water entry.
• Krypto Forefoot sole: durable outer reinforcement in the high-wear area at the toe.
• Anti-flush ankle strap: minimizes cold water entry through the shaft with every movement.
• Anatomical and minimalist design: snug fit, without chafing seams or unnecessary bulk.

ADVICE FROM OUR EXPERTS

"The split toe is the difference between feeling the board and not. If you're coming from a round-toe boot, give it a couple of sessions to get used to it: it feels strange at first, but you'll really appreciate it during take-offs and turns in cold water."
— Core Surfing Team

O'NEILL WARRANTY — IT'S ALWAYS SUMMER ON THE INSIDE

O'Neill was born in 1952, when Jack O'Neill opened one of California's first surf shops in San Francisco and began experimenting with neoprene to stay in the cold Pacific water longer. That quest gave rise to an entire industry, and the brand, now based in Santa Cruz, remains a global benchmark in technical equipment for surfing, kitesurfing, and wakeboarding. Under the slogan "It's Always Summer on the Inside," O'Neill continues to develop materials like FluidFlex to offer more warmth with less volume. All O'Neill products distributed by Core Surfing come with an official manufacturer's warranty.

USE AND CARE INSTRUCTIONS

Rinse the boots with fresh water after each session to remove salt and sand, both inside and out, and let them dry in the shade in a well-ventilated area, never in direct sunlight. Avoid leaving them damp and closed in a surf bag for long periods to prevent odors. To put them on more easily, dampen the inside or use a thin plastic bag like a sock.

SIZE GUIDE

READY TO SURF ALL WINTER WITHOUT COLD FEET CUTTING YOUR SESSION SHORT?

Get the O'Neill Heat Ninja 5/4mm ST at Core Surfing: free shipping on orders over €50, 24-48h delivery to the Peninsula, and official warranty from an authorized O'Neill distributor.