O'Neill Psycho Freak 4/3 Back Zip Wetsuit

O'Neill Psycho Freak 4/3 Back Zip Wetsuit 5 5 6
SKU: ONL4958
Eligible for FREE SHIPPING!

Availability: Out of stock

Regular Price: $529.95




Indulge in the O'Neill Psycho Freak Back Zip Wetsuit and relish in the comfort of a supreme aquatic outfit built for the pursuit of cold water surfing. Featuring the most advanced materials in the market, the Psycho Freak holds nothing back when it comes to flexibility, durability, and top of the line performance. Matching a feather-light air-cell rubber core to a water-shedding hydrophobic exterior, O'Neill's TB3 Neoprene will not disappoint. The super soft, pre-stretched jersey retains its form for maximum flexibility and snaps back to hug the body for a snug, natural fit leaving you warm, comfortable and ready for more waves.

The Psycho Freak sets itself apart with not just the highly advanced TB3 material, but it also has 100% fully sealed seams using a 4mm silicone-based urethane seal that is applied to both sides of the triple-glued seam. Lightweight, non-chafing, waterproof and flexible, the seam seal locks in the warmth and in conjunction with the Z.E.N. back zip closure system and anti-flush barrier, keeps a watertight, flush-free suit that offers insane ease of use and incredible comfort. Set yourself up for success by investing in the best with the O'Neill Psycho Freak Wetsuit.


  • Thickness: 4/3mm
  • Neoprene: TechnoButter 3
  • Seams: Sealed/Taped
  • Zipper: Back Zip
  • Hood: None
  • Model Year: 2019
  • Manufacturers Part Number: 4958

Product Features

  • TechnoButter 3 neoprene in arms and shoulders
  • TB-Air Firewall Smoothskin in chest and back
  • TechnoButter Firewall neoprene in lower body and upper back
  • Z.E.N. back zip closure system
  • Triple glued and blind-stitched seam construction
  • Stitchless super seam weld both inside and out
  • Rash free double super seal neck
  • Barrier with drain holes
  • Code red urethane coated zipper
  • Super seal low profile cuffs
  • Abrasion resistant krypto knee padz
  • Secure external key pocket with loop


O'Neill Psycho Freak 4/3 Back Zip Wetsuit I will always go back to this website!Review by Dannie Dannie
I did not order for myself. I ordered for my husband's birthday present. He wanted a O'Neal psycho freak 4/3 mm wetsuit. First of all this wetsuit was very hard to find... they were sold out everywhere and Cleanline had one left! They were also having a 15% off code which was really nice too! I got my shipment quick and they even put little candies in it! It was exactly what he wanted. He has lived in Southern California his whole life and has surfed his life... he says this wetsuit is "pure warmth" ! I have already told all of my friends with husbands who surf and anyone I know who surfs about this website! We will def. order through them again! Thanks Cleanline for making my husbands birthday wishes come true :)
(Posted on 4/8/2019) 2019-04-08
O'Neill Psycho Freak 4/3 Back Zip Wetsuit Never straying again Review by Waterdog Waterdog
First of all, excellent service from Clean Line Surf, first time I’ve used them but will not hesitate to use them again.

Have been surfing for 35+ years and settled into O’Neill wetsuits about 25+ years ago due to being beat I had used. About 5 years ago strayed to a very high end 4/3 wetsuit after hearing good thinks about their suits from several friends(the ones that pioneered the chest zip). Good suit but was not impressed with the warmth or stretch realitive to what I had experienced with my older O’Neill’s. Decided to go back to O’Neill with this wetsuit... hands down the warmest, lightest, and stretchiest 4/3 I’ve worn. Recently was out in 46-48 degree water, on overcast, foggy, drizzly day for about 2 1/2 hours. Not just warm but toasty, crazy flexibility as well. Worth paying premium price. As a reference, my other top of the line chest zip, in same temp range my legs are numb within a 1-1/2 hours and never close to being toasty. And stretch and weight are not nearly as good. Never straying away from O’Neill again!
(Posted on 12/21/2018) 2018-12-21
O'Neill Psycho Freak 4/3 Back Zip Wetsuit Flexible, Light, WarmReview by Surfing Grandpa Surfing Grandpa
I've been wearing O'Neill wetsuits since 1972. I've had a Psycho 2 and 3, and I now have a Psycho Freak (PF) 4/3 TB2 and now a PF 4/3 TB3. My new PF is designed to be flexible which is very important while paddling and riding a short board in Santa Cruz. It is super light which helps my endurance. The PF TB3 is also warm, and I'm never chilled, because of the TB Air Firewall in the chest and back; TB3 arms and shoulders, and TB3 Firewall from the waist down. The ZenZip with drain hole prevents flushing with its super seal pullover neck. I recommend this suit combined with a TB3 hood for superior flexibility and warmth in Santa Cruz conditions.
(Posted on 11/23/2018) 2018-11-23
O'Neill Psycho Freak 4/3 Back Zip Wetsuit It's greatReview by Venice Calif. Venice Calif.
I use this for winter open water swimming, not surfing. Lots of good features here. It does not let in much water, so that there's little or no initial shock when you first get in. Fits very well. Quite light in weight for the thickness. Flexible. If any water does get in (say through the neck line from my back stroking) my body heat warms it up immed. The only downside is that the wrists and ankles are pretty tight, which makes it a bit difficult to get in & out of. But I think that's just part of the deal. You can't have a suit this good without firm extremities. I would def. buy again, and I'm looking forward to swimming in it this winter. Total positive.
(Posted on 11/14/2018) 2018-11-14
O'Neill Psycho Freak 4/3 Back Zip Wetsuit WORTH every dollar! Outstanding Warmth and quality... Review by BuoyJunkie BuoyJunkie
This was my first O'Neill wetsuit. I was looking for something to keep me warm riding early season/buoys on my jet ski. I am usually cold when standing around in a wetsuit (2mm basic PWC brands, what I have had) once I have been in the water. The activity of riding is intense and active, but I am rarely warm(even riding) till later in the summer when it is 90-100 degree air temp and 70+ water temp. The thermal/evaporative cooling effect, wind, overcast sky, and cold water always makes me cold. I can usually only get warm by taking off the wetsuit, or putting on dry clothes. ENTER the O'Neill Psycho Freak 4/3... WOW! I was riding, hanging out on shore, and standing in 60 degree water all day, perfectly warm (never thought about being cold). Air temps were mid 70's, overcast, off and on rain. I was truly amazed! I have never been warm enough to do that even later in the season. The cold/water doesn't hardly penetrate this new neoprene and Insulation combo at all. Friends that know me were asking, "What's up, you're always cold?" The sun came out a bit (on day 2 - 80 deg), and I actually got warm enough to let some 60degree water in to cool off a bit after a long break from riding. I can see this suit being too warm for me in the summer (which has never been the case before, under 75+deg water/100+deg air), but it has extended my riding season comfort by 4 months. I dreaded early morning races and early season Moto time. The QUALITY is incredible, and I've not experienced neoprene this stretchy ever! I will be looking to buy a lighter O'Neill suit for the summer, mostly for protection from racing. I am Male/49y/160#/ riding for 35 years. Cleanline Surf went above and beyond, treating me as valued customer. I was impressed!
(Posted on 3/12/2018) 2018-03-12
O'Neill Psycho Freak 4/3 Back Zip Wetsuit Would highly recommendReview by FW FW
This suit is way more flexible than my Psycho Freak 4/3 with TB2, super warm and comfortable. Would highly recommend the investment in this suit. Cleanline Surf is the type of company you love to deal with. Super responsive and deliver more than you expect with a good follow up on your purchase and satisfaction with you product. 10 out of 10 recommendation. I deal with a lot of online order places and these guys far surpass everyone else. Good business model.
(Posted on 1/29/2018) 2018-01-29

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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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