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O'Neill Heat 3/2 Wetsuit

O'Neill Heat 3/2 Wetsuit 4.65 5 12
SKU: ONL4404
Eligible for FREE SHIPPING!

Availability: In stock

Regular Price: $279.95


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The O'Neill Heat 3/2 Wetsuit continues to wow with the amount of high end features you get for such an amazing price. Not only is the Heat Wetsuit made from ultra gooey UltraFlex DS Neoprene and warm FluidFlex Firewall, but it's also sealed with Single Fluid Seam Welds. Add in a redesigned zipper panel with a Red Zone Zipper, easy-in-easy-out usability, clean retro graphics and this suit is hard to beat.


  • Thickness: 3/2mm
  • Neoprene: UltraFlex
  • Seams: Sealed/Taped
  • Zipper: Back Zip
  • Hood: None
  • Model Year: 2018/2019
  • Manufacturers Part Number: 4404

Product Features

  • Back Zip - easy entry
  • Redzone water resistant zipper
  • Wind-proof smoothskin
  • Double super seal neck
  • Seamless paddle zones
  • External key pocket with loop
  • Hand-cuff stitch sleeve anchor
  • Fluid seam weld
  • UltraFlex neoprene
  • FluidFlex Firewall in the chest


O'Neill Heat 3/2 Wetsuit Great and WarmReview by kDub kDub
I put off upgrading my old wet suit way to long. First session out in the new suit was a night and day difference.
(Posted on 1/2/2018) 2018-01-02
O'Neill Heat 3/2 Wetsuit Cleanline is the Best!!!Review by Vince D. Vince D.
I love my new wet suit, but I was really impressed with Cleanline and their staff. I received my wet suit and there was a small hole by the back zipper. Cleanline took back the suit and sent me a new one right away. They keep me informed during the entire process. My new wet suit is perfect and is just what I ordered.
(Posted on 12/25/2017) 2017-12-25
O'Neill Heat 3/2 Wetsuit Perfect for SoCal waterReview by Surfdude Surfdude
Fits great and warm.
Super fast delivery and great service from the
Folks at Cleanliness Surf Co.
(Posted on 12/20/2017) 2017-12-20
O'Neill Heat 3/2 Wetsuit Great Service- Good SelectionReview by Brenden Brenden
I picked one of these up for Kayaking up north. Being tall and slightly Dad-bod-esque, its hard to find something comfortable (especially given the sitting position in surfskis vs. surfing. O'Neill barely carries larger sizes on their own website so I was stoked to find a XXXL on your guys site. Delivery was quick and loved the personal touch. Thanks guys!
(Posted on 4/19/2017) 2017-04-19
O'Neill Heat 3/2 Wetsuit Great suit, great transaction, poor key storageReview by kpisa kpisa
Second O'neil Heat 3/2, still love the warmth and fit. However, they moved the key storage to the side of the knee, and I just lost my car key on a wipeout. Never happened with the key pocket location down by the ankle on the older suit. I can see the keyholder cover material stretching with knee flex with this new suit, so it's an issue. So, don't store your valuable or only key in there!

Great transaction from the Cleanline surf team. Would buy from them again.

4 stars instead of 5 due to the loss of $70 for new key
(Posted on 2/23/2017) 2017-02-23
O'Neill Heat 3/2 Wetsuit Great suit, dumb zipperReview by Old School Old School
I've used O'Neill Heat suits for years. They are great except for the zipper which is stiff and tends to eat into the rubber along the edge of the zipper line. This one seems even worse. (I have a Rip Curl spring suit which has never done this, so I know it's possible to do it better.)
Otherwise great suit - perfect fit (XL; I'm 6ft 185lb) and they get warmer every year. The 3/2 Heat is really all you ever need in SoCal. The seams used to split a lot but I'm hoping these new welded seams won't.
(Posted on 12/6/2016) 2016-12-06
O'Neill Heat 3/2 Wetsuit THE BEST FOR THE MONEYReview by Topless Boarbag Topless Boarbag
Been surfing since 1963 and this is without a doubt the most comfortable wetsuit I've put on and used. Our San Diego water get's maybe 56ish to 59 in the winter and the difference is the welded seams. The arm pit area is never an issue and getting it on and off is a breeze. No wind can get to you and the knee pads are a semi rough like vinyl material. Great job on a great suit. Mahalo
(Posted on 11/7/2016) 2016-11-07
O'Neill Heat 3/2 Wetsuit Great Suit Great ServiceReview by Harold Harold
This is the third Heat I've bought and the second from Cleanlines. No hassles and no tax.
Even better.
(Posted on 4/25/2016) 2016-04-25
O'Neill Heat 3/2 Wetsuit Good well made suit w/ changes neededReview by Frank from Bend Frank from Bend
Bought a large tall. The legs were long enough but the arms are not. The waterproof zipper is not (it leaks) and the pull string is too short. But, Josh and the Cleanline crew are great!
(Posted on 4/21/2016) 2016-04-21
O'Neill Heat 3/2 Wetsuit Best value wetsuit everReview by Jim Jim
This is the third O'Neill Heat I have bought in the past 8 years and still wear my 4-year old Heat as a backup. The quality has improved with every new model and the Heat is by far the best value in wetsuits today in any brand. A back-zip is a very important feature to me for quick in-and-out and O'Neill's sizing is generous (I wear an XLS). It is comfortable riding my SUP in air/water temps in the mid-50's. Thanks Josh!
(Posted on 4/13/2016) 2016-04-13
O'Neill Heat 3/2 Wetsuit Wetsuit and service oneill 3/2 xxlsReview by Snarlywave Snarlywave
I got excellent service and even a brief note. Thanks josh. The suit fits good, i'm stoked and i'm preparing to surf all winter down in jax fl. I live in georgia( no surf here). I travel for waves. .i enjoy bigger surf with emptier lineups. an underground surfer that shows up for juice., and fades away with flatness. I would purchase more surf stuff from cleanline! Stay RAD. And thanks for the specialty size suit. I like to eat. Daryl M.
(Posted on 10/19/2015) 2015-10-19
O'Neill Heat 3/2 Wetsuit Close to GreatReview by Doug Doug
For my height and weight, the MT size could be longer in the arms and legs by 1.5 inches. It could also be snugger in the crotch and butt bottom. The quality and construction are excellent. Adding the fuzzy-side Velcro patch to the left side of the zipper is a big plus. It lets the closure stick to itself when putting the suit on, taking it off and hanging it to dry. It takes four or five sessions for the knees to relax enough to allow easy flexing. The suit is my third and best O'Neill Heat.
(Posted on 3/30/2015) 2015-03-30

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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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