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O'NEILL

O'Neill Men's Reactor-2 3:2mm Back Zip Full Wetsuit, Lightweight Warmth with Good Flexibility for Surfing, Paddleboarding, Kayaking

  • Based on 1,400 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Sep 28
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Size: Medium


Color: Black/Black


Pattern Name: Wetsuit


Description

The O’Neill Reactor-2 wetsuit is engineered for performance in a value-driven package, making it the perfect choice for any water enthusiast. Combining stretch, durability, and comfort, this wetsuit delivers everything you need for fun on the water without compromising quality. Designed with Ultraflex neoprene, the Reactor-2 moves with your body for unrestricted performance while still providing dependable warmth. Flatlock-stitched seams enhance comfort and durability so that you can stay active longer without irritation. Whether you’re surfing, swimming, paddling, kayaking, wakeboarding, waterskiing, snorkeling, diving, windsports, or just enjoying a day on the water, the Reactor-2 offers a reliable fit, fresh modern style, and the trusted O’Neill quality that’s built to last. Available in multiple sizes and color options, this wetsuit is ideal for beginners, water adventurers, and seasoned athletes alike.

Product Dimensions ‏ : ‎ 16 x 16 x 5 inches; 2.07 pounds


Item model number ‏ : ‎ 5040


Department ‏ : ‎ mens


Date First Available ‏ : ‎ August 4, 2017


Manufacturer ‏ : ‎ O'Neill Wetsuits


Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.:


Best Sellers Rank: #11,656 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #8 in Full Wetsuits


#8 in Full Wetsuits:


Customer Reviews: 4.4 4.4 out of 5 stars (1,400)


Brand Name: O'NEILL


Sport Type: Boating, Diving, Kayaking, Surfing, Swimming


Age Range Description: Adult


Global Trade Identification Number: 60


Item Highlight: Lightweight Warmth and Flexibility for All Water Activities


UPC: 191015029060


Number of Items: 1


Included Components: Water Sports Equipment


Item Weight: 0.27 g


Item Type Name: Wetsuits


Manufacturer: O'Neill Wetsuits


Model Number: 5040


Unit Count: 1 Count


Manufacturer Part Number: 5040


Warranty Description: GENERAL WARRANTY INFORMATION AND POLICY If the product is found to be defective under normal use and proper care, O'Neill Wetsuits will repair or replace, at O'Neill Wetsuits' option. This decision to replace or repair is made by the O'Neill Wetsuit Warranty Department after receipt of the defective product. At no time does O'Neill Wetsuits offer refunds. For more information, go to


Closure Type: Zipper


Sleeve Type: Long Sleeve


Wetsuit Form Type: Full Body Suit


Item Thickness: 3 millimeters


Chest Size: 40.5 inches


Size Map: Medium


Waist Size: 33 inches


Material Type: Neoprene


Color: Black/Black


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Sep 28

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Suit Up and Dive In: O'Neill Men's Reactor-2 Wetsuit Feels Like a Cozy Coat in the Water!
Size: Large Color: Black/Black Pattern Name: Wetsuit
The O'Neill Men's Reactor-2 3/2mm Back Zip Full Wetsuit is nothing short of amazing! It feels like wearing a warm, cozy coat while you’re in the water. This suit keeps your entire body warm and comfortable, making it perfect for extended sessions in chilly conditions. Not only does it provide excellent thermal protection, but it also offers remarkable flexibility. You can move freely and comfortably, whether you're paddling, diving, or swimming. The back zip design makes it easy to put on and take off, adding to the overall convenience. If you’re looking for a wetsuit that combines warmth with excellent mobility, this is the one to get. It’s a fantastic investment for anyone serious about staying warm and agile in the water. Highly recommend it for its comfort and performance! ... show more
Reviewed in the United States on September 13, 2024 by Han Shopped First
    • Great
Size: Small Color: Black/Black Pattern Name: Wetsuit
Worked perfectly in the cool water.
Reviewed in the United States on July 16, 2026 by RM
    • Can't wait to try this new O'Neill 3M/2M suit. Perfect fit!
Size: Medium Color: Black/Black Pattern Name: Wetsuit
The fit is perfect. The leash to zip it up is the perfect length. The cuffs at the sleeves and ankles feel like very little water if any will come in. I could already feel my body heat retention not leaving the suit so again I feel confident I won't be shivering at 25 and 30 ft depths. I will update again after my first freedive in a few weeks at Lake Ouachita at Blakely Mountain Dam. Last year's wetsuit was a Dark Lightning 3 mm and I floated like a cork. If you were snorkeling, I guess that would be a good thing as you wouldn't have to work so hard to stay on top of the water. But the drawback was two things. First, water came in at the sleeves and the ankles which I tried to avoid and yes it was cold. When you are a freediver, you want to stay warm, but you DON'T want to work yourself to death trying to swim down 15 or 20 ft. The Dark Lightning suit wore me out because when I got to the bottom of the lake, I didn't have any air left to enjoy the dive because I kicked so hard to keep from floating back up to the top. The reviews on the O'Neill state the suit is not very buoyant which will also be a big plus if indeed that is the case. Also, hopefully this year I will be making the trip to Beaver Lake to their dive park there and reviews already state the water there is much colder than most lakes in Arkansas, but much to see. Promise to update review after first successful excursion with my new O'Neill wetsuit. Just as a guide for the fit, I am 5'11 and 170 lbs. and I ordered the common M size with the perfect outcome for the fit. ... show more
Reviewed in the United States on March 27, 2019 by Tx Freediver
    • Looking forward to comfortable, warm surf sessions with this suit this coming fall and winter.
Size: X-Large Color: Black/Graphite Pattern Name: Wetsuit
Just a note on my credibility and expertise....I have longboard surfed Socal for the past 55 years and gone through dozens of wetsuits of most major brands. I am easy to please but hard to fit. I just received my O'Neill 3/2 Reactor 2 today and found the materials to be very good quality and well put together. I was a bit reluctant to order an O'Neill based on many years ago past experience of O'Neills being seemingly built for tall, slender individuals (of which I am neither,) but I couldn't pass up at this price (1/3 the cost of my current fullsuit) an opportunity to give O'Neill another chance for my future business. I am 5-10/210 lbs with a beer-barrel 45" chest and 36" waist, kinda like a '50s wrestler. I ordered an XL suit based on the sizing chart, and past experience of XLS being too restrictive. The good news is that with the new super-stretch materials the suit pulled on and off no problema. (OK Wetsox helped a bit and I highly recommend them.) It was properly snug without feeling binding, and the neck, wrists and ankles feel very watertight. It was not baggy in the arms and legs. It looks like it's gonna work fine. The bad news is (1) that the neck was pretty tight on my 18" neck, and may become uncomfortable over time; and (2) I couldn't get the zipper started up without the help of my laughing wife. (I've always thought wetsuits should come with a tab at the base of the spine to hold on to while pulling up the zipper. I often have one put on by a local suit repair.) As the water temps here drop next month I'll give the suit the 'acid test' with a few surf sessions. I'll update this review if any discrepancies are found, and how it performs. ... show more
Reviewed in the United States on October 28, 2019 by Lawdawg
    • Shipped quickly, real stoked to use it...
Size: X-Large Color: Black/Black Pattern Name: Wetsuit
I love it as a first time suit. An affordable 3/2 option...
Reviewed in the United States on May 15, 2026 by KRISTOPHER WILLIAM KRAMER
    • XL short Fits perfectly for Athletic/Muscular build
Size: X-Large Short Color: Black/Graphite Pattern Name: Wetsuit
I’m 5’8” 190 lbs., with 46” barrel chest and wide shoulders and back, 30” inseam, and this suit fits perfectly in XL Short. I have a very hard time finding non-custom wetsuits that fit, so I’m thrilled about this one. Usually when I find a one piece that fits up top, the legs are about 6” longer than I need. I plan on using it for temperate water Scuba. Due to my wide lats I can only get the rear zipper up half way by myself due to material bunching, but the fit is not restricting at all once fully zipped with some help. ... show more
Reviewed in the United States on July 7, 2025 by AC
    • Good fit and value.
Size: Large Tall Color: Black/Slate Pattern Name: Wetsuit
I was looking for an entry level wetsuit to water ski occasionally. Was unsure about size but finally went for a Large-Tall. It fits perfectly. For context I'm 6'1 (185cm) and 180 lb (82 kg) with a lean muscular fit. Was a bit worried it would be too long or to loose around the waist -happily that is not the case. I read in some reviews that ppl tend to go for wetsuits larger than needed. I also tried the MT and L (that friends have). The MT was a bit tighter but also fit well... I'm trying to put on some extra muscle mass which is why I went for the LT -If that's not a concern and you like a tighter fit then go for the MT. The L had shorter sleeves/legs but was also a good fit. At that point it really came down to the LT being on sale. ... show more
Reviewed in the United States on May 6, 2024 by Lucas
    • Zipper
Size: Large Color: Black/Black Pattern Name: Wetsuit
I love this wetsuit but the zipper is horrible about coming open. 2nd one that this has happened. This one only lasted 2 dives
Reviewed in the United States on September 3, 2026 by jonathan clack

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