O'Neill Mutant 6/5/4mm Split Toe Wetsuit Boots
Pickup available at Bananaway - Ljubljana
Usually ready in 24 hours
O'Neill Mutant 6/5/4mm Split Toe Wetsuit Boots
38
Bananaway - Ljubljana
Podmilščakova ulica 46
1000 Ljubljana
Slovenia
Spend over 100 € and Bananaway covers your shipping. For orders below 100 €, shipping is 19 €.
Place your order before 12:00 and we’ll ship it the same day.
Our experienced instructors guide you in choosing the right equipment based on your skill level, conditions, and goals.
All products shown online are in stock and ready to view at our store in Ljubljana, Slovenia.
Winter Wetsuit Boots with an Internal Split Toe
The O'Neill Mutant ST 6/5/4mm are winter wetsuit boots for anyone who stays on the water through the coldest months. The neoprene is thickest where your foot needs the most insulation and thinner where it needs to flex.
The split toe is hidden inside: your foot is more stable on the board and does not slide in the boot, while heat does not escape through a separate toe. The FluidFlex Firewall lining wicks moisture away from the skin and traps warm air.
January surf, winging in strong wind or windsurfing on a freezing lake: with the Mutant, fatigue sends you home, not the cold.
Who Are the O'Neill Mutant ST Boots For?
The Mutant ST is made for those who want maximum warmth and extra stability on the board in cold water.
We recommend it for:
- surfers, windsurfers and wing foilers who walk on the board and want a stable, responsive boot
- other water sports fans looking for a warm boot for cold water
- anyone who wants warm feet without losing board feel
O'Neill Mutant ST Benefits
Stability and control
The internal split toe stops your foot sliding inside the boot and improves balance.
Maximum warmth
The 6/5/4mm thickness insulates where your foot loses heat and stays flexible where it bends.
Warmer, drier skin
The FluidFlex Firewall lining wicks moisture and boosts the warmth of the neoprene.
Less cold water inside
Sealed GBS seams with internal tape and an anti-flush shin strap keep water out.
Board feel despite the thickness
A thin multi-density rubber sole protects your foot while keeping feel underfoot.
Quick to put on
A heel pull loop lets you slip the boot on without tugging at the neoprene.
Comparison: Mutant ST 6/5/4mm vs Epic RT 5mm
The Mutant ST 6/5/4mm is a warm specialist with an internal split toe and Firewall lining for maximum warmth and stability. The Epic RT 5mm round toe boot is the more affordable, comfortable choice for cold water. Compare them among all our wetsuit boots.
Material and Technology
The heart of the Mutant is the FluidFlex Firewall lining, a light thermal material that wicks moisture and adds warmth. The GBS seams are additionally sealed with tape on the inside.
A light rubber Ultralight Foxing Support System supports the foot and adds durability where wear is highest.
| Feature | Value |
|---|---|
| Thickness | 6/5/4mm |
| Material | FluidFlex Firewall lining |
| Seams | GBS, internally taped |
| Water temperature | up to 14 °C, including the coldest water |
| Toe | internal split toe |
| Height | high |
| Sole | thin multi-density rubber |
| Closure | shin strap, heel pull loop |
| Sizes | EU 38–46 |
Do I Wear the Mutant Boots Under or Over My Wetsuit?
Put the boots on first, line your big toe up with the internal split, then pull the wetsuit legs over the boots so water cannot run in from the top.
O'Neill boots run slightly small, so if you are between sizes, go one size up. Rinse with cold fresh water after use and air dry.
Why Choose O'Neill?
O'Neill develops its neoprene at its Area 52 R&D centre and tests it with athletes who chase waves in the coldest seas. The Mutant is the result of that work for winter conditions.