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O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit

O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit 4.85 5 7
SKU: ONL5338
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Cleanline Staff Member Matt Cleanline Staff

Matt Says:

"Firstly, if you get this wetsuit you won't be disappointed. It has been our best selling hooded wetsuit for years, and this year the Psycho Tech 5.5/4 Hooded wetsuit has been upgraded with stitch-less seam technology which is one of the biggest updates we've seen in a while. This means, all internal seams now feature TB3x Tape giving the suit an even more watertight, and durable seam. On top of this, you get all the usual features of the Psycho Tech like the super stretchy hydrophobic TB3 neoprene, and one of the best and most watertight zipper/entry systems in the industry. O'Neill is always a good choice and this year is no different when it comes to their flagship wetsuit."


The O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit is one of our top selling wetsuits. It's made with buttery soft TechnoButter 3 neoprene and will keep you toasty warm with its heat-generating TechnoButter Air-Firewall insulating interior jersey. To ensure water stays out it has super seal cuffs, a F.U.Z.E. (Front Upper Zip Entry) closure, and a urethane coated zipper with offset teeth as an anti-flushing barrier. Best of all it was constructed using a stitchless seam technology and a fluid seam weld to keep water out. Stay warm and toasty in any condition with the Psycho Tech.


  • Thickness: 5.5/4mm
  • Neoprene: TechnoButter 3
  • Internal Lining: TechnoButter 3 Air-Firewall
  • Seams: Sealed/Taped
  • Zipper: Chest Zip
  • Hood: Attached
  • Model Year: 2019/2020
  • Manufacturers Part Number: 5338

Product Features

  • F.U.Z.E. Front Upper Zip Entry: free floating zipper panel and anti-flush barrier with drain holes to keep you dry and loose
  • Redzone water resistance zipper: urethane coated offset zipper teeth keeps water out
  • 360 Barrier with drainholes
  • Super seal cuffs on wrists and ankles
  • Smoothskin hood with cinch cord and visor
  • Stitch-less seams: 100% triple glued and TBX3 taped interior seams with an exterior fluid seam weld
  • Fluid seam weld
  • TechnoButter 3: arms, shoulders, shins and calves
  • TechnoButter 3 Air-Firewall Smoothskin: chest and back
  • TechnoButter 3 Firewall: thigh and bum
  • Aqua Alpha: eco friendly solvent glue that is water based and free of VOC's
  • Limestone-based neoprene sourced from Japan
  • Hidden key loop on lower right leg


O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit great suitReview by surferdoc surferdoc
Huge improvement from my old suit. Very flexible and soft, paddling was easier and pop up was 1/2 second quicker. Surfed in 42 deg water for 2 hours and I was still warm. Cleanline was great too. This is my 2nd suit I have purchased from them and customer service was outstanding
(Posted on 1/21/2020) 2020-01-21
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit Awesome Service Review by Jerseygirl Jerseygirl
I bought this wetsuit for my husband as a Christmas gift and just wanted to commend the customer service from Cleanline. Not only did the wetsuit arrive on time for a great price, but we got a nice handwritten note along with some sweet samples and surprises. Will be ordering from here again!
(Posted on 1/7/2020) 2020-01-07
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit Great purchaseReview by JR JR
Extremely flexible and comfortable suit. Doesn't feel like 5.5/4 at all and definitely keeps me warm. I've used it to surf around the Northeast and it's the perfect fit
(Posted on 12/27/2019) 2019-12-27
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit Worth every pennyReview by Aleksey Aleksey
Love it. Super stretchy and warm. Thechnobutter 3 is amazing. Highly recommend.
(Posted on 12/23/2019) 2019-12-23
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit Great suitReview by PA PA
super stretchy for a 5mil - and very comfortable except for the chin area. I like how the Xcel drylock has the chin mold - the Oneill does not so it is either tight right under lip or you have to have it under your chin.

(Posted on 12/18/2019) 2019-12-18
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit You will not regret the purchase!Review by Windsurfer Windsurfer
I windsurf - I need something that will keep me warm in the high 30mph+ winds of the fall windsurfing season when temperatures are low and windchill is high. This suit does it perfectly! I also appreciate the range of motion that it provides. The quality is the best I have seen from any of my previous wet-suits. I love the seam welds the techo-butter - all of it! I am bullet proof when I have this suit on and look forward to the true cold water windsurfing that will occur in the early Spring - bring it on!
(Posted on 11/13/2019) 2019-11-13
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit Super WarmReview by Ace Ace
The question isn't, " how cold of water can you run this suit in?" It's "How hot can you stand?" Amazingly, the comfortable fit on this suit I could handle up into the lower 60's in water temp at Westport WA... but it was getting pretty hot indeed. This suit was awesome through every month of the winter; but indeed gets too hot above 60 deg water.

Fit wise: At 5'6" I am a 29" waist with a 40" chest. Cleanline placed me in a small and that's been great because the material really does stretch comfortably over my chest size. It wasn't too terribly long either. That said, I may try a 4/3 in MS with the same psychotech materials for the summer months if the water keeps creeping over 60 deg this season . . . it's tolerable in this suit if you cycle and leak in some sea water off and on, but going to a 4/3 might be a cozier option once the heat is on.
(Posted on 7/12/2019) 2019-07-12

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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


Returns are easy! We understand that in some situations returns or exchanges may be necessary. We also want you to be stoked on your purchase. If you are not 100% satisfied with your purchase you may return it for a full refund, or exchange within 30 days of receiving your order. Items must be in new condition with original tags and packaging.

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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