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Questions & Answers

FAQ

What is the material of the O'Neill 4/3mm Epic Men's Full Wetsuit?

The O'Neill 4/3mm Epic Men's Full Wetsuit is made from 100% UltraFlex neoprene, offering superior flexibility and comfort.

What is the Lumbar Seamless Design (LSD) in the O'Neill Epic wetsuit?

The Lumbar Seamless Design (LSD) in the O'Neill Epic wetsuit is a design feature that minimizes water entry, keeping you warmer for longer during your water sports activities.

What is the purpose of the covert blackout zip in the O'Neill Epic wetsuit?

The covert blackout zip in the O'Neill Epic wetsuit is a re-engineered design that effectively keeps water from entering at the back-entry point, ensuring you stay dry and comfortable.

Does the O'Neill 4/3mm Epic Men's Full Wetsuit provide any knee protection?

Yes, the O'Neill 4/3mm Epic Men's Full Wetsuit features Krypto Knee Padz, offering robust protection against abrasions.

Does the O'Neill Epic wetsuit have any insulation?

Yes, the O'Neill Epic wetsuit features water wicking firewall insulation, which ensures breathable warmth and moisture-free comfort during your water sports sessions.

DR F : Sizing recommendations? I am 5'10" 210, 17" biceps, 26" Quads, 44" chest, 48" shoulders and a 43" waist. ThanksMario C : XL or 2XL.. Arms and legs will run a little long..
KYUNGUN K : Can I use this suit for diving?SUNG HYUN L : yes you can. I always use this suit for divingSTEPHEN H : Absolutely you can dive in this suit. With it being a thicker suit just make sure before going on the dive what weight you will have to add to counter act.MATTHEW B : Totally good for diving. Functions more like a 3mm than a 4mm suit temperature wise.DEVIN R : Yes, I've used the epic 4/3 for multiple dives
Shopper : Are the seems taped?LAURENCIO G : No the seams are not taped, however, they are very well stiched and I have had no issues. Love the suit and recommend it.
HERIBERTO S : what is 4mm and what is 3mm?MATTHEW B : The forward core/torso is primarily 4mm with 3mm surrounding the back zipper for flexibility, the arms and legs are 3mm proximally and 2mm distally. Overall a super comfortable suit and a great value.MICHAEL G : IIRC the arms and lower legs are 3mm, the rest is 4mm. My advice is to just get one, especially if you have an athletic build and are hard to fit. I've been very pleased with mine, and Leisure Pro's service and prices beat out most. - MikeDEVIN R : With all neoprene wetsuits, the first number (4mm) represents the thickness of the neoprene in the torso area and the second number (3mm) represents the thickness of the neoprene in the extremitiesBLAINE W : 4mm and 3mm represent the thickness of the wetsuit in millimeters. The heavy wear parts of the suit are 4mm thick and the other parts of the suit are 3mm thick. The thicker the suit, the more body heat can be retained and thus the warmer the wearer stays.SUNG HYUN L : torso and thigh are 4mm, below knee is 3mm
Shopper : Why Did You Choose This?JELANI H : ComfortCHAD W : needed new suit for our dive tripJOHN W : Good news bad news. Still diving but I'm becoming a geezer so my 3/2 isn't warm enough any more for long drift dives. Also good for summer white water when water isn't snow melt.LAURENCIO G : Buying because me 3/2 is not enough for diving in Costa Rica. Will try the 4/3 and leave a review as to how well it works.HARLY Z : recommended by staff at divers direct as best value, then found it here for $20 cheaper

Reviews about this item

Review Summary

2025-11-25T19:00:00

Rated 5 out of 5

Great value for the price

Great value for the price

Jair R.

2025-05-21T20:00:00

Rated 5 out of 5

Thus suit fits and functions perfectly for my activities

Another quality product with a great fit. Purchasing from website was easy. I mostly use this for kitesurfing and wingfoilung

Brian D.

2022-05-20T20:00:00

Rated 5 out of 5

Fits true to size looks great

It fits true to size being a tall thin guy can be hard to find a wet suit that fits true to size. Recently used 40-50 degree water at it kept me comfortably warm. So far the quality is really good. The zipper is heavy duty compared to previous wetsuits used. Seem stitch quality is high. It?s a good looking wetsuit.

Cory R.

2022-04-07T20:00:00

Rated 5 out of 5

Great wetsuit!

Northeast USA surfer. Had the Epic 3/2 and bought the 4/3 as it got colder. You can really feel the difference in warmth! A bit tight across the shoulder (I wasn't able to compare it to a large) and possibly the large is a better choice when nearing the top end of specs/size. Durable and holding up well. Great choice for the price!

Joe

2022-04-06T20:00:00

Rated 5 out of 5

O'neill always perfect!

O'neill always perfect!

AL R.

2022-03-30T20:00:00

Rated 4 out of 5

Very good seal hardly any

Very good seal hardly any water gets in - but difficult to remove the suit over my feet - maybe the more expensive suits are made of neoprene that stretches better

Charles K.

2022-03-28T20:00:00

Rated 5 out of 5

recently purchased the epic 4/3

recently purchased the epic 4/3 and have been paddle surfing with it for several sessions and i have been stoked on the fit and mobility in the waves

clayton s.

2022-03-18T20:00:00

Rated 5 out of 5

Fits great and an awesome

Fits great and an awesome suit

John W.

2022-01-19T08:59:47

Rated 4 out of 5

It must be at least 10 characters

Responsive retailer! The suit was delivered on time without any problem.

YOSSI Z.

2021-11-24T19:00:00

Rated 5 out of 5

excelente comodidad y confort ,

excelente comodidad y confort , Perfecto para bucear en aguas cálidas (Ecuador) buena calidad del material . Soy instructor de buceo y soy buen exigente con mis wet suits gracias ..

Jennifer V.

2021-11-23T19:00:00

Rated 5 out of 5

Epic 4/3

Good value, warm, comfortable, I have a couple of these to alternate and wear during Fall surfing in Northern California.

Rey

2021-11-03T20:00:00

Rated 5 out of 5

Epic value

Good fit and easy in & out back zipper

Michael L.

2021-10-31T20:00:00

Rated 5 out of 5

I was worried about fit but I followed the size chart and the wetsuit fits perfect. I'm going to use it in a week or two.

I will leave another review after I use it.

ROB

2021-10-28T20:00:00

Rated 5 out of 5

Best wetsuit ever!!!!

I was finally able to try it in colder weather. It did not disappoint. It is by far the warmest wetsuit I've ever owned. The quality is outstanding. I'm going to enjoy this for a long time!

Eddy R.

2021-09-21T20:00:00

Rated 5 out of 5

Wetsuit

Have only worn it once. It kept me warm.

John C.

2021-09-16T20:00:00

Rated 5 out of 5

Works great!

Works great!

Matthew K.

2021-09-14T20:00:00

Rated 4 out of 5

love it

i really like this wetsuit. the only thing is that the shins fill up with water every time i am getting out of the ocean. it's like a big funny bloated bottom leg until i bend over and release the water out of the bottom. i don't know if that's a sign the fit isn't right or what. it's hard to imagine it being any tighter, the fit feels great for me besides that. either way, it keeps me warm and very easy to move in.

CJ M.

2021-09-02T20:00:00

Rated 5 out of 5

Quality

Can't complain one bit.You get what you pay for...

Michael R.

2021-08-19T20:00:00

Rated 5 out of 5

good

Size is right. it feels pretty warm.

Qichao Q.

2021-08-14T20:00:00

Rated 5 out of 5

Great suit

I bought a medium short and it fits like a glove. While it feels tight on dry land it is just right in the water and gives all the flexibility you need. Because of the fit, there are no voids to allow excess cold water to enter. I use it in Santa Cruz, ca and it works well.

William H.

2021-05-19T20:00:00

Rated 4 out of 5

Thumbs up

Works great. Doesn't load up and can jetski in 35° water no problem .

R C.

2021-02-17T19:00:00

Rated 4 out of 5

A little Big

Been buying O'Neill wetsuits for 40 years. I've always been a MS for sizing. But the recent 4/3 and 3/2 I've bought from O'Neill has been very large in the calf area allowing a lot of water in. May seem picky, but thought you should know. Thanks.

Nelson H.

2021-01-09T19:00:00

Rated 5 out of 5

EPIC 4/3MM BACK ZIP FULL WETSUIT,

Great wet suit I've had 3 of them .I surf a lot so I go through wet suits. I do wish that the Epic 4/3 3XL came in the chest zip style and still fit like the back zip. Just because I'm a big guy doesn't mean I don't want to look cool .lol also can you guys give us a bit more tab at the locked in neck flap really hard to open and velcro is so strong that it damages the wetsuit.

Dean R.

2020-11-10T19:00:00

Rated 5 out of 5

O'Neill Wetsuit

I love my wetsuit! I went out the other day in 50-60 degree water and my whole body stayed warm the whole time.

Akiva R.

2020-11-09T19:00:00

Rated 5 out of 5

Great Suit

Great wetsuit for the price! If you're looking for a high quality suit, but don't want to spend $400 - the Epic is a great choice.

Matt R.

2017-12-31T10:39:04

Rated 5 out of 5

Oâ??Neil 3-4

So far so good. I dive year round mid state Florida. Winter night dives included. Gets a little chilly. Water temp is tolerable but air temp can be in the twenties. Add wind and itâ??s downright cold. 37 degrees when I dove this morning. The Oâ??Neil 3-4 has been just right. Got to carry about 4 lbs more. No big deal. The tab at the top of the zipper sticks to the inside of the suit but other than that itâ??s all good, not super high end but considering the price, I recommend it.

JOHN C.

2017-06-28T08:48:52

Rated 4 out of 5

Great value, missing just one feature in my opinion

This is the 2nd O'Neill Epic 4/3 mm full suit I've owned. Overall great value for the money. I especially like the new feature that keeps the neck velcro enclosure out of the way during entry & exit. And the neck seal is improved as well. The only complaint I have: I wish they would add a cuff or stitch or seam to the bottom of the legs. This would prevent fraying at the bottom of the legs, which is how the suit starts to deteriorate. That said, I still got a lot of use out of my first Epic, and was happy to purchase another one.

John W.

2017-05-17T20:00:00

Rated 4 out of 5

Preplacement for Neil Pryde

Since my perfect fitting NP 98T (medium tall) 5/4/3 wetsuits neck rips out through half a windsurfing season every year I decided to try another manufacturer. The O'neill 4/3 doesn't come in a M/T so I went with the closest size. I'm 165 6'1"+ and the O'neill medium is about an inch short but I figured that was going to happen so its tight pulling down on the neck. The Velcro neck closure is way to grabbie and sticks to any part of the wetsuit when not on which kinda wears out the material. Now for the pluses - It's soo easy to get on AND off! One needs to be a Houdini to get a NP wetsuit on and especially off! Because the neck isn't ripped I stay pretty warm inside although I do notice when getting in the cold SF Bay water I can feel it going through the zipper. The funny thing is that the material doesn't even feel like neoprene like in the NP. It feels almost porous but so far hasn't made a difference. If O'neill only made wetsuits in medium tall...

Mario

2016-12-10T03:05:24

Rated 5 out of 5

O'neill Epic 4/3mm and O'neill Heat 4/3mm OVER other suits.

At 62 I surf big waves and swim long distances 2-5 miles per day 4-5 days/week). I was 5' 11'' tall, weighed 245, with a 31'' inseam, 42" waist, and 46-47" chest, but slender arms with only 13.5" biceps. This fall I hooked up a harness in my pool and lost 20 lbs. in 2 months of swimming 1-3 miles per day. At 225 lbs I was aiming for 210 lbs., but the water temp cooled to 68 degrees and my 3/2mm wetsuit was not warm enough. At first I layered a 1.5mm neoprene shirt and got more warmth and less flushing, but my arm flexibility was reduced. I decided to test 4 backzip wetsuits for colder waters; 1. Hyperflex Voodoo 4/3mm XXL (LFS) 2. O'Neill Epic 4/3mm XXL (GBS) 3. O'Neill HEAT 4/3mm XXL (LFS) 4. Quiksilver Syncro 5/4/3mm XXL (LFS) 1. Hyperflex Voodoo - My first shock was that the Voodoo was the hardest suit to put on by far even over a thin lycra bodysuit partly because of the non-slip fleece lining, but also because the arms were very tight even on my skinny arms, and the suit was very tight around my shoulders. I needed help pulling the floodgate over my head, and to zip the suit up. Over all I felt like I was in a more restrictive 5mm "standard 50% flex neoprene" wetsuit rather than a 100% stretch suit. I could not imagine swimming 1/2 mile in this suit because of the lack of flexibility. 2. O'Neill Epic 4/3 mm XXL (GBS) AND 3. O'Neill HEAT 4/3mm XXL-short (LFS) The 2 O'neill suits both went on SO easily it absolutely shocked me, and both fit me absolutely perfectly even thought the HEAT was a 2XL-Short and the Epic just an XXL. The Epic 4/3mm would have stretched out a bit more in length in the legs if I needed it to. The HEAT fit me perfectly like a body skin. The Neoprene in both suits was absolutely buttery, and both felt far more flexible than the Voodoo 4/3mm or than a NeoSport Xspan 5mm had felt a month earlier. The heat retention of the front panel in both suits was immediately evident. The Liquid Fluid Seal over all the seams on the HEAT 4/3mm suit were totally stretchy, and the added back heat panels convinced me it would be significantly warmer than the Epic 4/3mm with GBS. The shape of the neck in both suits put a little pressure on the front of my throat - perhaps because my posture is really poor - but this issue became completely unnoticeable once I took the Heat 4/3mm and then the Epic 4/3mm into the water. 4. Quiksilver Syncro 5/4/3mm XXL (LFS) - For a cold water suit, this would have been my second choice behind the O'neill HEAT 4/3mm with LFS. It went on easily even with the back floodgate, and I was able to zip it up without help from my wife. The Neoprene felt absolutely wonderful and stretchy, and the suit felt totally comfortable once zipped up. I knew I could swim miles warmly in this suit. But it was at least 3-4 inches too long in the legs, and the arms were also a little long for me, bulging a little around my biceps, which would not be good in cold water. If I lost the extra 20 lbs. the Quiksilver Syncro XXL would become way too loose. Since the O'neill HEAT 4/3mm obviously fit me the best, and would fit well at 20lbs less, it felt the warmest, and it felt flexible enough to do my longest swims, I put it back on, threw on some 5mm NeoSport booties, donned a swim cap and 3mm Neosport gloves, stepped down into a pool of 58 degree water, hooked myself into my swimming harness and swam a mile. I felt NO water getting in through the neck, or the seams of the O'neill HEAT wetsuit, and I felt NO chill at all !!! In fact, after about a quarter mile I pulled down on the front collar to let in a little cool water as I heated up. Seeing the recommended water temperature range of 45-60 degrees of the HEAT, I decided to immediately try the O'Neill Epic 4/3mm GBS too. In the 58 degree water I felt just a little more cool water seeping in than with the HEAT, but I was warmed up from the mile swim so I decided to swim another 1/2 mile. The Epic swam so easy I decided to keep the O'neill Heat 4/3mm for waters 45-58 degrees, the O'neill Epic 4/3mm for 57-68 degrees, and my Neosport XSpan 3/2mm for waters 68 degrees and up.

JEFFREY C.

2014-03-10T20:00:00

Rated 4 out of 5

a little different from the pic.

The only way to see actual figure of product is the photo that have been uploaded. a little printings on the suit are different. except for that, others are good

gawasaki

O'neill 4/3mm Epic Men's Full Wetsuit Specifications

  • Material

    Nylon 1 & 2 Neoprene Rubber

  • Thickness

    4/3mm

  • Seams

    Glued & Blind Stitched (GBS)

  • Closure

    Back Zipper with Pull Tab Leash

  • UPC Code

    603731974123

Oniell Mens Wetsuit Size Chart
    XS SM MD M Short M Tall LG L Short L Tall XL 2XL 3XL
Height  ft/in 5'7"-5'9" 5'8"-5'10" 5'9"-5'11" 5'6"-5'8" 6'1"-6'3" 5'10-6'0" 5'7"-5'9" 6'2"-6'4" 5'11"-6'1" 6'0"-6'2" 6'0-  6'2"
cm 170-175 173-178 175-180 169-174 185-191 178-183 171-177 188-193 180-185 183-188 183-191
Weight lbs 125-140 135-155 150-170 140-160 160-180 170-190 160-180 180-200 190-210 210-230 230-250
kgs 57-64 61-70 68-77 64-73 73-82 77-86 73-82 82-91 86-95 95-104 104-113
Chest in 34-36 36-38 38-40 38-40 38-40 40-42 40-42 40-42 42-44 44-46 47-49
cm 88-93 93-98 98-103 98-103 98-103 103-108 103-108 103-108 108-113 113-118 119-124
Waist  in 28-30 29-31 30-32 30-32 30-32 32-34 32-34 32-34 34-36 36-38 38-43
cm 71-76 74-79 77-83 77-83 77-83 83-88 83-88 83-88 88-93 93-98 98-110

15 Accessories for O'neill 4/3mm Epic Men's Full Wetsuit

  • All Accessories (15)
  • Equipment Care & Maintenance (9)
  • Hangers (6)

About O'neill 4/3mm Epic Men's Full Wetsuit

FEATURED REVIEWS

EPIC 4/3MM BACK ZIP FULL WETSUIT,

By Dean R.

Great wet suit I've had 3 of them .I surf a lot so I go through wet suits. I do wish that the Epic 4/3 3XL came in the chest zip style and still fit like the back zip. Just because I'm a big guy doesn't mean I don't want to look cool .lol also can you guys give us a bit more tab at the locked in neck flap really hard to open and velcro is so strong that it damages the wetsuit.

Great Suit

By Matt R.

Great wetsuit for the price! If you're looking for a high quality suit, but don't want to spend $400 - the Epic is a great choice.

The Epic has many of the same sick features as O'Neill's high-end wetsuits, including 100% UltraFlex neoprene, double seal neck closure, LSD (lumbar seamless design) and re-engineered covert blackout zip. Clean graphics and sharp style lines make the Epic the best value in the industry. Get maximum water sport performance without the chilly sensation with O'Neill Epic 4/3mm Full-Suit. High quality 100% Super-Stretch Ultra-Flex DS neoprene provides stretch factor of 150%, soft and stretchy comfort, lightweight and improved stretch that gives you total freedom of movement while surfing or snorkeling. Suit has a covert blackout rear zipper entry that has off-set teeth an interlocking zipper that keeps water from entering at the back-entry point. The zipper comes equipped with a pull tab leash for easy self-donning and doffing. With lumbar seamless design (LSD) that reduces the amount of water entering the suit while Krypto Knee Padz keeps your knees protected from abrasions.

Suit is equipped with a double seal neck closure, has strategic zero seamed under arms, paddle zones and all seams are triple glued and double blind stitched (GBS) for strength, durability and water tight integrity. Water wicking firewall insulation ensures breathable warmth and moisture free comfort as you attack the waves. Suit has an external key pocket for easy access after your water sessions. The O'Neill Epic 4/3mm Full Suit combines excellent quality and great value for your money. Suit is black in color, and available in multiple sizes.

O'neill 4/3mm Epic Men's Full Wetsuit Features

  • 4/3mm Epic Men's Full Wetsuit:
  • Maximum Water Sport Performance w/o the Chill
  • High Quality 100% UltraFlex 4/3mm Neoprene
  • Soft-and-Stretchy Comfort
  • Lightweight and Improved Stretch Factor 150%
  • Total Freedom of Movement while Surfing or Snorkeling
  • Covert Blackout Rear Zipper Entry:
    Off-Set Teeth an Interlocking Zipper
    Keeps Water from Entering at Back-Entry Point
    Pull Tab w/Leash for Easy Self-Donning and Doffing
  • Lumbar Seamless Design (LSD) Reduces Water Entry
  • Krypto Knee Padz, Knees Protected from Abrasions
  • Double Seal Neck Closure
  • Strategic Zero Seamed Under Arms, Paddle Zones
  • Seams: Glued & Blind Stitched (GBS) for Strength, Durability & Water Tight Integrity
  • Water Wicking Skin-Out Firewall Insulation
  • Breathable Warmth and Moisture-Free Comfort
  • Nylon 1 & 2 Neoprene Rubber
  • External Key Pocket for Easy Access
  • Excellent Quality and Great Value
  • Available in Multiple Sizes
  • Color: Black

Warranty Information

This product has a limited warranty of 12 months.

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Key Features

  • Stay warmer longer with this 4/3mm wetsuit, perfect for cool water surfing conditions.
  • Enjoy unrestricted movement; our Epic wetsuit's extra stretch material maximizes flexibility.
  • Glued and blind stitched seams enhance durability, keeping you comfortable in the water.
  • The back zip with pull tab leash makes getting in and out of this wetsuit a breeze.
  • This O'Neill full wetsuit provides excellent insulation for various water sports activities.
  • Get a snug, comfortable fit with our quality neoprene rubber that enhances your performance.

What's in the box:

  • 4/3mm Epic Men's Full Wetsuit
  • MFG 1 Year Limited Warranty