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O'Neill 4/3+ Psycho Tech Chest Zip Wetsuit

sku# 229605
O'Neill - 4/3+ Psycho Tech Chest Zip WetsuitO'Neill - 4/3+ Psycho Tech Chest Zip Wetsuit
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Product Info

When it comes to plunging yourself in water that average folks deem "psycho," the O'Neill 4/3+ Psycho Tech Chest Zip Wetsuit ensures you stay sane. With an extra 0.5mm of thickness in the extremities for added warmth, plus stitchless exterior fluid welded seams, the 4/3+ Psycho Tech Chest Zip Wetsuit serves as an impenetrable shield against the cold. Comprised of O'Neill's various new TechnoButter 4 materials, plus sustainable neoprene derived from recycled oyster shells and eco carbon, there's only one pyscho move here and that's NOT opting for a trusty suit like this...

Product Details


Recycled Oyster Shells and Eco Carbon Black Infused Neoprene

Recycled Dope-Dyed Yarn Jersey

TechnoButter 4X (Entry)TechnoButter 4X goes beyond the gooey stretch, and soft feel of TB3X. Recycled graphene fibers line the jersey allowing for incredible stretch with added strength and warmth retention, all with a new look.

TechnoButter 4 (Arms & Shoulders)TB4 builds on the legendary TechnoButter 3, the next evolution of the jersey introduces recycled yarns infused with graphene for increased wear strength and heat retention.

TechnoButter 4 Firewall (Thigh, Butt, Shins & Calves)The all new TechnoButter 4 Firewall utilizes the recycled graphene fibers at a thicker pile to create a fire hot feedback loop. As the body heat warms the graphene fibers they conduct the heat back into the body.

TechnoButter 4 Duraskin Air Firewall (Chest & Back)The next great thermal breakthrough made better with trapped pockets of air. TB4 Air Firewall uses a special lamination process paired with a core of aerated neoprene and a graphene fiber jersey to create the toastiest conditions. Take summer with you.


F.U.Z.E. Chest Zip ClosureO’Neill’s exclusive F.U.Z.E. (Front Upper Zip Entry) system offers a fresh alternative. Using the same free floating zipper technology as the patented Z.E.N. ZIP closure. The F.U.Z.E. closure keeps you dry and allows unrestricted flexibility.

Tapered Cuffs with Segmented 3D Wrist and Ankle Seals


O'Neill Hyperfreak Fire SeriesThe O'Neill Hyperfreak Fire range focuses on extreme warmth, high performance, increased durability, and comfort. All-new sustainable, buttery soft, heat recirculating TechnoButter 4 materials line each suit. These technologically advanced materials plus water-tight Fluid Seam construction have created a new cold water legend. Fire red-hot heat takes the innovative Hyperfreak legacy to the next level.

Redzone Water Resistant Zipper

360° Barrier with Drain Holes

PLUS (+) = 0.5mm Extra Thickness For Even More Warmth

Aqua Alpha Solvent Free Neoprene Lamination

External Key Pocket with Loop

Stitchless Exterior Fluid Seam Weld Technology with Interior Recycled TBX Tape


  • Wetsuit Thickness: 4/3.5 mm
  • Wetsuit Fit: Chest Zip
  • Material: Neoprene
  • Seam Sealing: Fully Taped, Welded Seams
  • Manufacturer Item Number: 5505-A00
  • Warranty: 1 Year

Other Notes

O'Neill products can only be shipped within the United States and Canada



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