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O'Neill Psycho Tech 4/3 Chest Zip Wetsuit

O'Neill Psycho Tech 4/3 Chest Zip Wetsuit 5 5 4
SKU: ONL5027
Eligible for FREE SHIPPING!

Availability: Out of stock

Regular Price: $419.95




The O'Neill Psycho Tech 4/3 Wetsuit holds the perfect blend of features and performance. Hydrophobic TB3 Neoprene, one of the lightest and most flexible wetsuit components to date, is strategically placed in the shoulders and extremities giving you maximum maneuverability where you need it, while TechnoButter Firewall Neoprene cushions the thighs and waist. A high performance combination that retains incredible warmth.

Offering the most advanced heat-trapping elements, the Psycho Tech has external fluid seam welds, internal taping in critical areas and quick drying TechnoButter Air Firewall Smoothskin panels in the chest and back to block wind chill and soak up the sun's warmth. Wrist and ankle seals, durable knee pads, heavy duty zippers are all part of the package along with a toasty warm two-layer F.U.Z.E chest zip that keeps water from entering at critical points and seams while retaining a relatively generous entry. Offering the best bang for your buck, the O'Neill Psycho Tech is simply a high quality, high-performance surfing wetsuit.


  • Thickness: 4/3mm
  • Neoprene: TB3 and TB-Air Firewall
  • Seams: Sealed/Taped
  • Zipper: Chest Zip
  • Hood: None
  • Model Year: 2019
  • Manufacturers Part Number: 5027

Product Features

  • O'Neill's exclusive Technobutter 3, maximum strength, hydrophobic neoprene with featherlight ENVY foam rubber core. Ultimate warmth and comfort. Built to last
  • TB-Air Firewall Smoothskin, the most advanced insulate neoprene available. Trapped air technology with quick-dry properties. Psychotically warm
  • Patented Z.E.N. Zip Entry with free floating zipper panel and anti-flush barrier-2 with drain hole, keeps you warm and unrestricted
  • Stitchless Super Seam Weld, 4mm silicone-based urethane seal applied to both sides of a triple-glued seam. Lightweight, non-chafing, waterproof and flexible
  • Arms/Shoulders: Technobutter 3
  • Chest/Back: Technobutter Firewall Smoothskin
  • Lower Body/Upper Back: Technobutter Firewall
  • Code Red urethane coated zipper
  • External Key Pocket with Loop


O'Neill Psycho Tech 4/3 Chest Zip Wetsuit Amazing as expected Review by Amazing suit Amazing suit
What a amazing suit! Super impressed with the techno butter 3 technology. I’ve tried other suits that just don’t fit right and O’Neil has been the best fitting, best quality suit I’ve ever owned. Cleanline surf delivered the suit without damage and threw in some goodies! What are you waiting for? Just buy it!!
(Posted on 6/14/2019) 2019-06-14
O'Neill Psycho Tech 4/3 Chest Zip Wetsuit Absolute Best WetsuitReview by Bolsa Chica 16.5 Bolsa Chica 16.5
I've gone through plenty of wetsuits from Matuse, Quicksilver, and Rip Curl. Nothing comes close to this O'Neill wetsuit. It is so easy to get in and out of the suit and the flexibility is second to none. I've had O'Neill wetsuits in the past and they're probably the most durable. I hope this one stands the test too. Thanks Cleanline for the unbeatable price and service. You guys are a class act.
(Posted on 3/19/2019) 2019-03-19
O'Neill Psycho Tech 4/3 Chest Zip Wetsuit excellent wetsuitReview by Dever Marine Dever Marine
excellent wetsuit,plenty of stretch,easy to get on and off.The water is only 38 F here so I have not been in the water with this suit yet.
(Posted on 3/11/2019) 2019-03-11
O'Neill Psycho Tech 4/3 Chest Zip Wetsuit A+ SuitReview by Biddy Biddy
Pros - Super warm, super flexible and really easy to get on, off and to paddle in. The graphite is a nice nuance but turns fairly dark once wet.

Cons - Absolutely nothing!

Conclusion - I've gone through a bunch of O'Neill suits in the past and this is hands down the best one I've ever worn. Been out in 10º Water/ 0º air (50º/32ºf) a few times and NO problems. Had a few 1.5-2h long sessions so far and still found dry spots when I took the suit off.

Matched with your trusty removable hood, I believe this to be the perfect year-round suit for anyone in the PNW. Plus, catch it on sale and it's a no brainer.

Cleanline's customer service is amazing too, both in the shop and online. Shipping was very quick up to Canada and my wife is always looking forward to the extra treats hidden inside.
(Posted on 12/15/2017) 2017-12-15

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Size Chart

O’Neill Men’s Wetsuits — Size Chart

The staff at Cleanline Surf specialize in sizing O'Neill Wetsuits. If you have never tried an O'Neill suit before, we strongly urge you to call us for expert advice on sizing. We do have a size chart available below, but please take it with a grain of salt. For the perfect fit the first time please call and speak with one of our wetsuit experts.

XS5′7″-5′9″125-140 lbs36.5-37.5″28.5-29.5″
S5′8″-5′10″135-155 lbs37.5-39″29.5-31″
ST6′0″-6′2″145-165 lbs37.5-39″29.5-31″
MS5′6.5″-5′8.5″145-165 lbs39-41″31-33″
M5′9″-5′11″155-170 lbs39-41″31-33″
MT6′1″-6′3″160-180 lbs39-41″31-33″
LS5′7.5″-5′9.5″160-180 lbs41-43.5″33-35″
L5′10″-6′0″170-190 lbs41-43.5″33-35″
LT6′2″-6′4″180-200 lbs41-43.5″33-35″
XLS5′8.5′-5′10.5″180-200 lbs43.5-46″35-37″
XL5′11″-6′1″190-210 lbs43.5-46″35-37″
XLT6′3″-6′5″200-220 lbs43.5-46″35-37″
2XLS5′9.5″-5′11.5″200-220 lbs46-48.5″37-39″
2XL6′0″-6′2″210-230 lbs46-48.5″37-39″
3XL6′0″-6′3″230-250 lbs48.5-51″39-44″
4XL6′1″-6′4″250-270 lbs51-53.5″44-48″

Full O’Neill Wetsuit Sizing Chart



If the product is found to be defective under normal use and proper care, O'Neill will repair or replace the product at our sole discretion. The decision to replace or repair a product is made by the O'Neill Warranty Department after receipt of the defective product. At no time does the O'Neill offer refunds. Defective product should be returned clean and dry, postage prepaid. Please include a note with product description, product defects, requested action, return address (be sure to include postal code, especially for Canadian addresses), daytime phone number with area code, customers name and a copy of the purchase receipt sent to the address below.

Suits without a copy of the purchase receipt will NOT BE COVERED UNDER WARRANTY.


  • Products classified as seconds
  • Fading from sunlight
  • Alterations
  • Materials over 1 year (from date of original purchase), or 90 days for accessories
  • Repairs or alterations done by anyone other than O'Neill or an O'Neill authorized repair facility
  • Warranty request without original receipt


Flat-Stitched Products, Glued and Blindstitched Products, and Fluid Seam Weld Products

  • Limited 1-year warranty (from date of original purchase) on workmanship and materials.

Neoprene Dry Suits

  • Limited 1-year warranty (from date of original purchase) on workman ship and materials (waterproof zipper excluded)


  • Limited 90-day (from date of original purchase) warranty on workmanship and materials


For repairs received from the dealer or end user, O'Neill offers:

  • 10 Business Day Turnaround for warranty Stitched Suits
  • 10 Business Day Turnaround for warranty Glued Suits
  • 20 Business Day Turnaround for warranty Fluid Seam Welded Suits
  • 30 Business Day Turnaround for all Non-Warranty Repairs

Repairs are to be returned clean and dry, postage paid. Please include the name and a daytime phone number with area code, return address, product description, and requested action.

Send Repairs To:

O'Neill U.S. Warranty Repair
1022 Bay Marina Drive, Suite 140B
National City, CA 91950
Tel: 1-800-331-1637


We understand that when purchasing gifts, returns and exchanges can be necessary, which is why for the Holidays we are extending our Return Policy so that anything purchased as a gift this Holiday Season is eligible to be returned by the end of January. If you are not 100% satisfied with your product you may return it for a full refund, or exchange by the end of the month of January 2020.

Please make sure your wetsuit fits before taking it in the water. We are not able to take returns or exchanges on used wetsuits.

Please reference our full Return Policy.

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