Men’s Full Wetsuit • Modular Hood or Neck Seal • Chest Zip • Black/Black
O'Neill Mutant II 4.5/3.5mm Chest Zip Full W/Hood
One premium cold-water suit with interchangeable hooded and non-hooded configurations.
The O'Neill Mutant II 4.5/3.5mm Chest Zip Full W/Hood is built around O’Neill’s Modular Chest Zip system, allowing riders to switch between hood and neck closures as conditions change. Recycled TechnoButter 3 through the chest, back and legs provides lightweight warmth, while stretch-focused Recycled TechnoButter 3X is used through the arms and entry. Triple-glued and blindstitched seams with exterior Fluid Seam Welds complete a flexible, durable and premium watertight construction.
- 4/3mm+ Construction
- 4.5/3.5mm Effective Thickness
- Modular Chest Zip
- Interchangeable Hood and Neck
- TechnoButter 3
- TechnoButter 3X
- Fluid Seam Welds
- Sizes S–2XL
Why You’ll Love the O'Neill Mutant II
Hooded or Non-Hooded Flexibility
The modular system allows the upper closure to be changed between hood and neck configurations, making the Mutant II adaptable across changing wind, air and water conditions.
Lightweight Warmth
Recycled TechnoButter 3 is used through the chest, back and legs to balance insulation, flexibility and low weight.
Extra Stretch Where You Move
Recycled TechnoButter 3X through the arms and entry improves mobility in high-movement areas and helps make the chest-zip opening easier to use.
Premium Sealed Construction
Triple-glued and blindstitched seams are reinforced with exterior Fluid Seam Welds for a flexible, durable and premium watertight seam system.
Modular Chest Zip System
Hood Closure
Use the hooded configuration when additional head and neck coverage is needed. The integrated upper closure helps limit exposure around the hood and chest-entry area.
Single-Seal Neck Closure
Swap to the interchangeable neck closure when a hood is unnecessary. This gives the suit a more traditional full-wetsuit configuration without requiring a second suit.
Chest-Zip Entry
The front entry keeps the back panel uninterrupted while providing a low-profile closure across the upper chest.
Easier Entry and Exit
O’Neill redesigned the Mutant II for easier entry and exit, supported by flexible TechnoButter 3X material through the entry and shoulder areas.
Materials and Panel Construction
Recycled TechnoButter 3
The chest, back and legs use Recycled TechnoButter 3 for flexible, lightweight warmth through the suit’s primary insulation zones.
Recycled TechnoButter 3X
The arms and entry use O’Neill’s more stretch-focused Recycled TechnoButter 3X to support paddling freedom and easier entry.
Recycled Oyster Shells
Recycled oyster-shell material is incorporated into the neoprene formulation as part of O’Neill’s updated material package.
Eco Carbon Black
Eco Carbon Black is infused into the neoprene construction alongside the recycled oyster-shell content.
Recycled Dope-Dyed Liners
The suit uses recycled dope-dyed yarn liners as part of its interior and exterior fabric construction.
Aqua Alpha Lamination
O’Neill uses Aqua Alpha solvent-free neoprene lamination to bond the suit’s materials.
Flexibility, Fit and Water Control
Seamless Contortionist Shoulders
The seamless shoulder design reduces restrictive seam placement through a critical movement zone, supporting paddling and upper-body mobility.
Tapered Cuffs
Tapered wrist and ankle openings create a close fit at the extremities and work with the Plasma seals to manage water movement.
Plasma Wrist Seals
Plasma seals at the wrists reinforce the cuff interface and help keep the openings secure during active sessions.
Plasma Ankle Seals
Matching Plasma seals at the ankles support a close fit around the lower-leg openings.
Fluid Seam Welds
Exterior Fluid Seam Weld technology reinforces the triple-glued and blindstitched seams while maintaining the flexibility needed for movement.
Key Pocket with Loop
A built-in key pocket and retention loop provide a secure place for a compatible non-electronic key during the session.
Who Is the O'Neill Mutant II For?
Best Rider Profiles
- Surfers who regularly encounter changing conditions
- Riders who want hooded and non-hooded options
- Anyone looking for premium sealed-seam construction
- Surfers who prioritize shoulder and arm flexibility
- Riders seeking additional warmth over a standard 4/3mm
- Anyone who wants one adaptable full suit
- Cold-water riders using appropriate additional accessories
What You’ll Notice in the Water
- Flexible movement through the arms and shoulders
- Lightweight insulation through the core and legs
- A secure low-profile chest entry
- Close-fitting wrist and ankle cuffs
- The ability to switch between hood and neck seals
- Reduced seam leakage from the sealed construction
- Easier entry and exit than the previous design
Individual cold tolerance varies. Water temperature, air temperature, wind, session length and activity level should all be considered when selecting wetsuit thickness and accessories.
O'Neill Men’s Wetsuit Size Chart
| Size | Height | Weight | Chest | Waist |
|---|---|---|---|---|
| S | 5'8"–5'10" | 135–155 lb | 37.5–39 in | 29.5–31 in |
| MS | 5'6.5"–5'8.5" | 145–165 lb | 39–41 in | 31–33 in |
| M | 5'9"–5'11" | 155–170 lb | 39–41 in | 31–33 in |
| MT | 6'1"–6'3" | 160–180 lb | 39–41 in | 31–33 in |
| LS | 5'7.5"–5'9.5" | 160–180 lb | 41–43.5 in | 33–35 in |
| L | 5'10"–6'0" | 170–190 lb | 41–43.5 in | 33–35 in |
| LT | 6'2"–6'4" | 180–200 lb | 41–43.5 in | 33–35 in |
| XLS | 5'8.5"–5'10.5" | 180–200 lb | 43.5–46 in | 35–37 in |
| XL | 5'11"–6'1" | 190–210 lb | 43.5–46 in | 35–37 in |
| XLT | 6'3"–6'5" | 200–220 lb | 43.5–46 in | 35–37 in |
| 2XL | 6'0"–6'2" | 210–230 lb | 46–48.5 in | 37–39 in |
Fit guidance: A wetsuit should fit closely without large folds, gaps or loose areas that can collect water. If your measurements fall across different sizes, prioritize chest and waist fit while making sure the suit does not restrict breathing or shoulder movement.
Understanding O'Neill Size Types
Standard Sizes
S, M, L, XL and 2XL use O’Neill’s standard height and body-measurement proportions.
Short Sizes
MS, LS and XLS provide the chest and waist room of their base size with shorter height proportions.
Tall Sizes
MT, LT and XLT provide longer height proportions for riders who need additional torso, arm and leg length.
Need Help Choosing?
Call Windance with your height, weight, chest and waist measurements. We can help narrow down the best O’Neill size before you order.
What’s Included
Included with the Wetsuit
- O'Neill Mutant II 4/3mm+ full wetsuit
- Interchangeable hood closure
- Interchangeable single-seal neck closure
- Modular chest-zip entry system
- Built-in key pocket with loop
Product Configuration
- Color: Black/Black
- Men’s wetsuit sizing
- Full-length arms and legs
- Hooded or non-hooded setup
- Available sizes: S through 2XL, including short and tall options
O'Neill Mutant II FAQ
Is this a 4/3mm or 4.5/3.5mm wetsuit?
O’Neill officially names it a 4/3mm suit and states that its PLUS construction adds 0.5 mm. Windance therefore identifies the effective thickness as 4.5/3.5mm.
Is the hood removable?
Yes. The Modular Chest Zip system allows users to switch between the hood closure and a single-seal neck closure.
Are both closures included?
Yes. The Mutant system is designed around interchangeable hood and neck closures so the suit can be adapted as conditions change.
Where is TechnoButter 3 used?
Recycled TechnoButter 3 is used through the chest, back and legs.
Where is TechnoButter 3X used?
Recycled TechnoButter 3X is used through the arms and entry, where additional stretch supports movement and easier entry.
How are the seams constructed?
The seams are triple glued and blindstitched, then reinforced with exterior Fluid Seam Weld technology.
Does it have sealed wrists and ankles?
Yes. The suit uses tapered cuffs with Plasma wrist and ankle seals.
Does the suit use recycled materials?
Yes. O’Neill lists recycled TechnoButter 3 and 3X, recycled oyster shells, Eco Carbon Black and recycled dope-dyed yarn liners.
Does it use solvent-free lamination?
Yes. O’Neill specifies Aqua Alpha solvent-free neoprene lamination.
What water temperature is it designed for?
O’Neill does not provide one fixed temperature range on this product page. Suit choice depends on water and air temperature, wind, session length, activity level and personal cold tolerance.
Is this a men’s wetsuit?
Yes. O’Neill provides its men’s wetsuit size chart for this model.
Does it have key storage?
Yes. The suit includes a key pocket with a retention loop for a compatible non-electronic key.
Why Choose the O'Neill Mutant II?
The O'Neill Mutant II 4.5/3.5mm combines the coverage of a hooded cold-water suit with the flexibility to switch to a standard neck seal. Its recycled TechnoButter 3 and 3X construction balances warmth and mobility, while the Modular Chest Zip, seamless shoulder design, tapered Plasma seals and exterior Fluid Seam Welds create a versatile premium wetsuit for changing conditions.