ONeill Mutant 6/5/4mm Internal Split Toe Wetsuit Boots

• Thickness – 6/5/4 mm
• Style – Internal Split Toe (IST) wetsuit boots
• Material – UltraFlex neoprene for warmth and flexibility
• Lining – FluidFlex™ Firewall for enhanced insulation and quick drying
• Seams – Fully sealed and GBS (Glued and Blindstitched) with internal taping
• Toe – Internal split toe for improved balance and control
• Support – Ultralight Foxing Support System for secure fit and durability
• Entry – Easy on/off design with flexible ankle opening
• Sole – Durable textured grip sole for traction on slippery surfaces
• Warranty – 1 year workmanship and materials

Expert Advice

These boots strike an ideal balance between split-toe performance and round-toe warmth. The internal split design means you get the grip and control you’d expect from a split toe, but with the insulation and comfort of a sealed round toe boot. They feel solid and supportive underfoot — not floppy or overly soft — which gives great confidence when you’re pushing hard through turns or navigating reef entries. A proper, well-built winter boot that feels premium the moment you slip it on.

Product Description

The O’Neill Mutant 6/5/4 IST Wetsuit Boots are built to deliver outstanding warmth, durability and control for extreme winter surf conditions. Using O’Neill’s premium UltraFlex neoprene and FluidFlex™ Firewall lining, these boots provide serious insulation while staying surprisingly soft and flexible. With 6mm neoprene in the body and a thinner, more pliable 4mm ankle section, you get unbeatable warmth without losing mobility or feel in the water.

The Internal Split Toe (IST) design gives you the best of both worlds — the stability and grip of a split toe combined with the warmth and comfort of a round toe. Fully sealed, GBS seams with internal taping keep water out, and the Ultralight Foxing Support System reinforces structure for lasting performance. The textured sole offers excellent traction on slippery surfaces, while the flexible entry system makes them easy to get on and off, even on freezing mornings.

Whether you’re chasing winter barrels or storm swells, the Mutant 6/5/4 IST Boots are made to keep you warm, secure and confident in the harshest surf conditions.

Why Buy From Shore.co.uk

• We’ve been selling wetsuits and accessories for over 30 years
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