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O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018

O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 5 5 22
SKU: ONL4963
Eligible for FREE SHIPPING!

Availability: In stock

Regular Price: $489.95


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Cleanline Staff Member Matt Cleanline Staff

Matt Says:

"The Psycho Tech 5.5/4 has been our best selling suit for 3+ years straight, and for good reason. O’Neill has really taken the time to do the research and make the most high performance coldwater hooded wetsuit out there. Recently they released their new TB3 Neoprene, which is the biggest update you’ll see in the PsychoTech. Other than being lighter, and more flexible, it’s still the most watertight, easy to get into, high performance wetsuit out there for water temps from the low 50’s down into the 40’s. "


The latest and greatest version of the O'Neill Psycho Tech 5.5/4 Hooded Wetsuit is the same suit we all love, now fitted with Technobutter 3 Neoprene. Keeping a nearly identical design, the Hooded Psycho Tech was built to combat the rigors of hours spent paddling in cold temperatures. Including 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.

TB3 (TechnoButter 3) neoprene incorporates O'Neill's exclusive feather-lite ENVY foam core, creating one of the lightest and most flexible wetsuit components to date. The hydrophobic TB3 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. This tactical combination of materials and seams delivers both long term durability and a snug, comfortable fit.

Focusing on a pleasant and productive experience in coldwater conditions the Psycho Tech ensures you get all the features you need without any of the extra bells and whistles. 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: 5.5/4mm
  • Neoprene: TB3 and TB-Air Firewall
  • Internal Lining: TB-Air Firewall
  • Seams: Sealed/Taped
  • Zipper: Chest Zip
  • Hood: Attached
  • Model Year: 2018/2019
  • Manufacturers Part Number: 4963

Product Features

  • TechnoButter 3 neoprene
  • TechnoButter-Air Firewall neoprene
  • F.U.Z.E. Front Upper Zip Entry (chest) uses the same technology as our Patented Z.E.N. Zip entry with drain holes to keep you dry and feeling loose
  • Fluid Seam Weld, 8mm silicone-based urethane sealed exterior with a triple glued and blind stitched interior. Watertight, durable and ultra flexible seam
  • Attached hood with visor and cinch lock
  • Water Resistant Red Zone Zipper
  • F.U.Z.E 360° barrier with drainholes
  • Double seal collar
  • Super seal wrist cuffs
  • Krypto knee padz
  • Key pocket with loop
  • Plasma ankle seals
  • Strategic seamless paddle zones


O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Light and flexyReview by Steinarr Steinarr
As a surfer in Iceland for 25 years I can say with confidence that this is the best. The material is a real break through. it´s super stretchy and light. Thick wetsuits will wear you down if you surf 5 time a week for 4 hours each session. This one doesn´t. Buy it!
(Posted on 4/17/2019) 2019-04-17
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Flex!!!Review by Chris D Chris D
First off, the Cleanline team is beyond awesome! Figured out my size over the phone, got some recommendations based on my location (NJ), and threw in some extra goodies with my package!

I was just able to try out the suit itself for the first time earlier today - the water was right around 38-39* and I was in for a solid hour and a half. When I first tried it on, it felt like I was wearing a 3/2 getting ready for a summer swell! I love the fit, flex, and weightlessness of the thing. I did drop down from a 6/5 that I've worn the past few winters so I'll admit I wasn't quite as warm, but the suit did exactly as described by warming up with every movement I made - and the weight/flex gave me that extra energy to keep paddling around where I used to be absolutely dead after a paddle-out! Excited to see how this holds up through the colder air temps the rest of the winter, but I'm a believer now!! O'neill's got it going!

For reference, I'm 6'0, 170lbs with a bigger chest and the MT fits perfect...
(Posted on 1/25/2019) 2019-01-25
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Great wetsuit!Review by Elkappyton Elkappyton
This is my first thicket wetsuit so I have nothing to compare it to, but it seems to work great. I get cold pretty easy and am able to stay out 2+ hours in water temps around 38 degrees. The suit doesn’t get too much water in it unless you’re really getting thrown around. Also, I have zero problem paddling or moving around; it feels similar to my lower end O’Neill 3mm. All in all great suit and no complaints!
(Posted on 1/23/2019) 2019-01-23
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Great Service from Cleanline and a great wetsuit!Review by Jack Hanson Jack Hanson
This is a great wetsuit! Warm, light in weight, flexible... and, easy to get in and out of... Warm is the word, and now I have no worries about getting cold at any of the local rivermouths with cold winter runoff. I would highly recommend this suit to any of my surfing friends!
(Posted on 1/9/2019) 2019-01-09
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Winter sessionReview by Goyajoe Goyajoe
Josh just wanted to give you update on new suit.wind came late yesterday 3pm. as low tracked by.got rigged and in water 34 deg air and water blowing a gale too bad it got dark and I had to quit the new Pysco is GREAT!!!with new 6/5 mutant booties don,t even feel the cold.
(Posted on 1/8/2019) 2019-01-08
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 AwesomeReview by Dana Dana
Best winter wetsuit I have ever owned plus no tax and a good discount applied. Not only all this but clean line gave me a free shirt and a bar of wax ! Good company for sure and this wetsuit is the bomb I surf all winter in the northeast so I need a great suit too. Thanks cleanline!!
(Posted on 12/31/2018) 2018-12-31
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 The gold standard. Review by Sturge Sturge
Expensive but one of the best suits you can buy for the cold.
(Posted on 12/19/2018) 2018-12-19
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 epic suit, flexible and warm.Review by johnmont johnmont
so comfortable and warm its an amzing suit and built super rugged. I have 2 of these for 2 session winter days. I can change and warm up and then pull a dry suit on for the afternoon session in the ultra cold northeast. Cleanlne is a great store to buy from also.
(Posted on 12/19/2018) 2018-12-19
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Psycho warmthReview by Goyajoe Goyajoe
Had a session in new suit the other day 35 air.40 deg water.lightweight and stretchy.Have the same suit in 4/3 just fabulous!Have pyrotechs from 5 years ago those suits were and are great these have upped the game beyond belief.wear this rubber on the Great Lakes enough good can not be said!!
(Posted on 12/12/2018) 2018-12-12
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Excellent Review by Doggy Doggy
The suit is great, the best I’ve ever had so light and warm it’s insane feels like half the weight of my old O’Neill suit. But really Cleanline is the winner here. This shop not only shipped my suit for free and had it to me in 2 days they sent a post card thanking me for my purchase and personally writing in description of what I bought and hoping I enjoy it. I have to say that customer service is really nice. I love this place they have a customer for life.
(Posted on 10/12/2018) 2018-10-12
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Great wetsuit/ chest zip is greatReview by John K John K
Great wetsuit. I love the chest zipper and entry. Very warm yet more range of movement than others. When this one wears out, I will buy one more.
(Posted on 7/2/2018) 2018-07-02
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Flexyy Review by HAOLE HAOLE
Had a nice Excel for about 7 years. Just called it quits in my hotline, I had for another 7. This is the Cadilac of suits. You can move any place you want no struggle. This thing keeps water out very very well. It was between this and the nice rip curl, this one fit me better as I’m 6’ solid buck 80. Little bit taller inseam and longer arms I noticed compared to the high end rip curl. Went to the usual cape lookout in some heavier conditions twice now and I’m so impressed. Closest to no wetsuit you can find, doing laps around my mates! All bs aside it’s a great suit, I get out maybe 50 times per year so I should get about 2-3 years I’m hoping with this tech. Thanks again CLSS.
(Posted on 4/27/2018) 2018-04-27
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Warm, very warmReview by Simon Simon
Went out today ( early January) using the 5.5/4. Generally I stay pretty warm anyways and this suit was so warm I could easily have had a thinner wetsuit. If you feel the cold and want a really warm suit that was pretty easy to get off (even with those tired, after surf shoulders) this suit is for you. I wore slightly thin booties, which at the end of my surf got a little chilled but my body didnt get cold at all and I stayed out for almost 3 hours.
(Posted on 1/5/2018) 2018-01-05
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 January 1st, 2018 - Best winter suit I've ever had.Review by Tillamook Jake Tillamook Jake
I'm 6'1" @ 183 naked, and dig the size LT. I thought my last O'neill was awesome, but this one is even better. For a 5.5 mil suit it is super stretchy. The form fitting cut doesn't stifle paddling even on the longest sessions. The inside material doesn't grip to your skin so it's super easy to slide in and out of, dry or wet. Just about all of the high end wetsuits are really good now, but if you are looking for a high performance suit that works great for surfing a few times a week, go with an O'neill.
(Posted on 1/1/2018) 2018-01-01
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Psycho Tech Again and AgainReview by Joy Joy
Third Pyscho Tech suit I've purchased as a gift for my son. He surfs the Wa coast just about every weekend, and this is the suit he swears by. Stellar sales from Cleanlline.
(Posted on 12/20/2017) 2017-12-20
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 THE suit for the PNWReview by Tim Tim
SO light and flexible yet so warm. No flushing even when you end up in the washing machine. All the reviews and ratings for this suit are spot on. I wore Rip Curl for over 15 years, but this suit takes wetsuit technology a step higher.
(Posted on 12/17/2017) 2017-12-17
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Great, great wetsuit!Review by Walshie Walshie
Love this wetsuit. Surfing the northeast, winter water temps 45*, this suit is so warm. Easy in and out, really important changing in the parking lot. Highly recomend!
(Posted on 12/12/2017) 2017-12-12
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 All Performance No Frills Review by Cam Cam
This suit just works, it keeps you plenty warm even on the coldest NW days. I've worn almost all major wetsuit brands 5/4's and this is the best suit I have owned yet. The quality of this suits construction is hands down the best out there which I have seen. When I compare side by side my Xcel Drylock 5/4 you can see quality differences in the seams (and Xcel is no slouch). Suit drys quick and is flexible for a 5/4. What else do you need? Also, I had an older version of this suit (2015) and noticeable improvements have been made in regard to wetsuit material.

Only downfall to this suit is the hood, the visor is abnormally large and goofy looking so I just trimmed mine down with scissors.
(Posted on 11/26/2017) 2017-11-26
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Hands down the best suit I have ownedReview by Jason Jason
Buttery feel ultra warm water tight. The flexibility in this suit is impressive The boys at cleanline said this was the suit to get I was not at all disappointed
(Posted on 11/24/2017) 2017-11-24
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 O'Neill PsychotechReview by Josh Gizdavich, Owner of Cleanline Surf Josh Gizdavich, Owner of Cleanline Surf
So I've worn pretty much all of the major supplier's wetsuits available and obviously, everyone has their own opinions, likes, and dislikes. These are strictly my opinions so of course take all I say with a grain of salt. I've been wearing wetsuits for about 45 years now in the cold waters of the northwest ( northern Oregon where the Columbia river meets the Pacific Ocean). I've been wearing Patagonia wetsuits for the last three years and Ripcurl for three or four years previous. Before that was O'Neill and for many years Hotline was the choice for me.I only have allegiance to the best. I wear what I think is the best because my wetsuit is my most important tool. All this said I recently grabbed an O'Neill Psychotech off the rack because I kept hearing and listening to all the hype on the phone and in the shop. Paavo, my manager (awesome surfer, incredible guy)keeps telling me (and customers) what a killer wetsuit this is, and I really respect his opinion. Definitely O'Neill's flagship and best wetsuit ever! Wow big statement! So here is what I found, great, super soft, flexible and just buttery (Techno rubber) Neoprene. In the water the suit is unbelievably water tight. I couldn't believe how dry I stayed for a 2 and a half hour sesh. Also it's really REALLY warm. While sitting on my board between sets I could feel the sun baking the firewall interior lining like it was an electric vest! This is one GREAT wetsuit!
(Posted on 11/10/2017) 2017-11-10
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 super warm and way more flexible than R4 yulex!!Review by Chan Chan
super warm like R4 yulex. and wayyyyyyy more flexible and soft than R4.
i feel free to rotate my shoulder, the hood is not to tight, and very easy to take on and off!!
(Posted on 11/9/2017) 2017-11-09
O'Neill Psycho Tech 5.5/4 Hooded Chest Zip Wetsuit - 2018 Best suit I've ever owned Review by KookIsland KookIsland
This is my 2nd psycho tech 5.5/4. Have not used this one yet but my old one last 3 seasons of heavy east coast use. Soft flexible warm everything you want out of a winter suit. Would recommend to anyone. My 1st choice in winter suits
(Posted on 9/28/2017) 2017-09-28

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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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