O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit

O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit 5 5 11
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Cleanline Staff Member Matt Cleanline Staff

Matt Says:

"The Mutant wetsuit series has been around for nearly a decade and for good reason. It's one of the most versatile wetsuits on the market with its interchangeable hood and neckpiece. Essentially two wetsuits in one, the Mutant Legend 4.5/3.5 is now upgraded with TB3 Neoprene which is O'Neill's lightest and most flexible neoprene and arguably the best neoprene in the wetsuit business. At 4.5mm thickness with smooth skin chest and back panels for more warmth and wind protection, most would find this wetsuit would keep them warm with water temps in the 50's. Known for a very watertight fit, this is a definite long term favorite, and this year it's better than ever."


Surf your brains out in the O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit. It's made with Technobutter 3X in the arms and shoulders and Technobutter 3 Firewall in the chest and back. It also has a heat-retaining thermal layer, making it ideal for core warmth, and quick-dry properties. The hood and crew neck are interchangeable which is great depending on the conditions you're surfing and a Modular Closure system with a dual cinch to seal out water. This is a very special wetsuit made in honor of the great wetsuit legend Jack O'Neill.


  • Thickness: 4.5/3.5mm
  • Neoprene: TechnoButter 3X and TechnoButter 3
  • Interior Lining: TechnoButter Firewall
  • Seams: Sealed/Taped
  • Zipper: Chest Zip
  • Hood: Detachable
  • Model Year: 2019/2020
  • Manufacturers Part Number: 5135S

Product Features

  • Modular closure
  • Single seal neck and hood
  • Hood: internal lining TB Firewall and TechnoButter 3x
  • Contortionist seamless shoulder
  • Key pocket with loop on right leg, located below knee
  • Lumbar seamless design
  • Left to right chest closure
  • Plasma wrist and ankle seals to prevent flushing
  • TechnoButter 3X neoprene, in arms and shoulders
  • TechnoButter Firewall neoprene, in chest and back
  • TechnoButter 3 neoprene, in low body
  • External fluid seam weld everywhere but the chest and back
  • Internal fluid seam weld on chest and back
  • Aqua Alpha Solvent Free neoprene lamination


O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Excellent wetsuit, excellent service!Review by hatmaster hatmaster
I've had this suit for a few months and am very happy with it so far. I upgraded from an old Mutant 4/3 that has served me well for 10 years. This one fits almost identically, feels a tad lighter and more flexible, and is a little warmer. I get cold easily, and this kept me very toasty this winter in North Carolina with water in the 50's and air near freezing. Psyched that it's versatile enough I should be able stay comfortable as the water warms up this spring. The folks at cleanline sent out the suit quickly and even threw in a T-shirt and some stickers!

My only reservation about this suit is the price. I was able to snag mine on sale and feel like it's been worth it. Is it warmer and more flexible than my old Mutant? Is it ~$100 warmer and more flexible? Debatable - probably depends on how much money you have at the moment to invest in a quality suit.
(Posted on 3/12/2020) 2020-03-12
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Awesome wetsuit!Review by Fins & Tread Fins & Tread
This is my 4th Mutant, but 1st with TB3 and I could not be more pleased. I mostly surf in the PNW and the 4.5/3.5 with the hood is perfect. When I make my way further south to NorCal, having the hoodless option is why I continue to love these suits. Also, the service at Cleanline is always topshelf!
(Posted on 2/28/2020) 2020-02-28
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Excellent WetsuitReview by Peter Peter
I’ve had wetsuits for 25 years and I recently purchased this one. Originally I winced at the price but even on my first session I could tell it was worth every penny. The warmth is absurd and the flexibility is even better. It almost felt hot in 55 degree water, but felt like I wasn’t wearing a shirt while paddling. This suit is a must for Northern CA and up guys. Hats off to the crew over at O’Neill.
(Posted on 1/4/2020) 2020-01-04
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Great suit-Great service Review by Glen Glen
This is my second Mutant and I have found no reason to change. Fit is awesome and works great for the Oregon Coast. Cleanline is amazing and always provides knowledgeable, helpful, and friendly service. Could not be happier.
(Posted on 12/27/2019) 2019-12-27
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit ButteryReview by Schmuckatelli Schmuckatelli
Got it on the black friday deal. Cleanline surf was super friendly and nice shipping the suit with a handwritten note and a bar of wax and some starburst’s that i really appreciate. The suit is by far the most comfortable suit i on. The flexibility far exceeds the ripcurl flash bomb like and paddling is way better. I haven’t had much sessions past two hours just because I’ve always been so exhausted, but every single time I’ve worn the mutant legend I’ve had three hour plus sessions and only get it because the surf changes. There’s almost no restrictions when paddling and it feels like I’m swimming. The tb3 feels super silky and comfortable. With the hood I’m super toasty in 55-58F waters with only booties. Suit is kinda leaky but that’s because i ordered the xl when i should’ve gotten the l. Otherwise great suit and definitely getting one again.
(Posted on 12/18/2019) 2019-12-18
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit A travel wetsuitReview by Shorebreak Dave Shorebreak Dave
I live fairly south in Florida, so a 4/3 wetsuit is for travel, at least to north Florida, usually farther. The Mutant had long seemed a no-brainer, especially after an odd February weekend at Cape Hatteras where warm air and the Gulf Stream at the shoreline made wetsuits somewhat optional, and I'd brought a 5/4. This one is looking promising. It was supposed to be at Hatteras tomorrow, but obligations are keeping it in Florida for the moment.
(Posted on 12/16/2019) 2019-12-16
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Great suit, even better service! Review by Aaron Aaron
This is my 4th Mutant and by far my favorite in the line. The techno butter upgrade creates more mobility and flexibility without sacrificing warmth. I knew the suit would be good, but what surprised me was how great the customer service was at Cleanline. I've ordered many products from them and I'm always amazed by the promptness, professionalism, and kindness of their team. Thanks for being a great surf shop and sharing the stoke Cleanline!
(Posted on 11/7/2019) 2019-11-07
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Great Wetsuit!Review by Colleymann Colleymann
Purchased this wetsuit a few weeks ago and so far I am very happy with it. Seams are very tight and let very little water into the suit. Also the customer service with Cleanline has been top notch.
(Posted on 11/7/2019) 2019-11-07
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit GREAT SUIT VERY WARM/ SEALS LIKE A DRY SUITReview by JIM BO JIM BO
(Posted on 2/23/2019) 2019-02-23
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit amazing westsuit!!Review by DaveyTwoStep DaveyTwoStep
I live in Monterey, CA...this thing keeps me warm in that cold water! That techno butter neoprene rocks my socks off!

(Posted on 2/22/2019) 2019-02-22
O'Neill Mutant Legend 4.5/3.5 Hooded Chest Zip Wetsuit Great all-in-one wetsuitReview by Bryan Bryan
I love this wetsuit! Works great for Oregon waters with the hood as well as down south without a hood. The TB3 makes this suit super light and easy to paddle in. Also, keeps me toasty warm. I feel that the 4.5/3.5 is the perfect thickness for Oregon waters. Josh at Cleanline was incredibly helpful in helping me really dial in the perfect size and wetsuit for me. Great surf shop! Very friendly and helpful folks.
(Posted on 2/20/2019) 2019-02-20

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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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