O'Neill Reactor-2 3/2mm Wetsuit

The O'Neill Reactor-2 is a reliable 3/2 mm wetsuit that does the fundamentals well, offering decent warmth and flexibility at a price that will not empty your wallet.

O'Neill has been making wetsuits since the 1950s, and the Reactor-2 sits at the entry level of their current range. It is aimed squarely at divers and surfers who need a versatile suit for water temperatures between roughly 18°C and 24°C — which covers a lot of Australian diving, from Sydney's summer months through to the Sunshine Coast year-round. At $249, it competes with suits from Rip Curl and Billabong at a similar price point, and it holds its own on warmth and comfort while leaning on O'Neill's long pedigree in neoprene construction.

## Overview

The Reactor-2 uses O'Neill's Ultraflex neoprene in a 3/2 mm configuration: 3 mm through the torso and 2 mm in the arms and legs. This split keeps your core warm while maintaining good arm mobility for swimming and gear manipulation. The suit uses flatlock stitching throughout, which sits flat against the skin and avoids the chafing that older overlock seams can cause. The back-zip entry system is straightforward and familiar — a long zip runs from the lower back up to the collar with an over-the-head cord pull. It is not as watertight as chest-zip designs, but it is easy to get in and out of, which matters when you are gearing up on a rocking boat at Julian Rocks or changing beside the car at Bare Island. Compared to the Rip Curl Dawn Patrol at a similar price, the Reactor-2 offers comparable warmth but slightly better arm flexibility thanks to the thinner 2 mm limb panels. Against higher-end suits with glued and blind-stitched seams, the Reactor-2's flatlock construction will let in a bit more water, which is the main trade-off at this price.

## Key Features

- 3/2 mm Ultraflex neoprene: 3 mm torso, 2 mm arms and legs - Back-zip entry with cord pull for easy self-donning - Flatlock stitch construction throughout - Krypto knee pads for abrasion resistance - Seamless paddle zones to reduce chafing in the underarm area - Adjustable collar with hook-and-loop closure - Suitable for water temperatures approximately 18°C to 24°C - Available in men's sizes S through 4XL

## The Good

- The Ultraflex neoprene is genuinely flexible for an entry-level suit. Arm movement during swimming is unrestricted, and reaching back to adjust your BCD or grab a slate does not feel like a wrestling match. This matters during long dives where you are constantly moving. - At $249, it undercuts many comparable 3/2 mm suits from premium surf brands. For divers who are not in the water every day, spending more on a high-end suit is hard to justify when the Reactor-2 covers the basics so competently. - The back-zip is easy to use solo. The cord pull is long enough to reach without contorting yourself, and the zip runs smoothly even after repeated saltwater exposure. For divers who gear up without a buddy handy, this is a practical advantage. - Krypto knee pads hold up well to shore-entry abrasion. Crawling over rocks at Shelly Beach or kneeling on sand during skills practice will not shred the knees within a season. - Sizing is generally consistent with O'Neill's published charts. If you have worn an O'Neill suit before, your usual size should translate directly. - The seamless paddle zones around the underarms are a thoughtful inclusion that reduces chafing during extended surface swims.

## The Bad

- Flatlock stitching lets water seep through the seams. In water below 18°C — common in Melbourne, Adelaide, and the NSW south coast during winter — you will feel the chill creeping in. This is a warm-water suit, not a cold-water solution. For those conditions, you need a 5 mm suit with sealed seams. - The back-zip design inherently allows more water flushing than chest-zip alternatives. Every time you bend forward or arch your back, a small amount of water enters through the zip area. In tropical water this is barely noticeable; in cooler water it limits comfort. - The collar can allow water entry at the neck, particularly during duck dives or head-first descents. A snug fit helps, but the seal is not as tight as higher-end suits with integrated hoods or glued collars. - Durability of the neoprene is adequate but not exceptional. After a season of regular use, expect some compression in high-wear areas like the knees and elbows, which reduces insulation. This is a suit that will last two to three seasons of regular diving, not five.

## Verdict

The O'Neill Reactor-2 is a sensible choice for Australian divers who spend most of their time in water above 18°C. It delivers comfortable flexibility, easy entry, and reliable warmth in the conditions it is designed for — summer diving from Sydney southward, and year-round in Queensland and northern NSW. It is not the suit for a Port Lincoln winter or deep dives off Tasmania, and the flatlock seams will not keep you as warm as sealed alternatives. But at $249 from a brand that has been building wetsuits longer than almost anyone else, it represents honest value for recreational divers who want a dependable 3/2 without overthinking it.

Star Rating: ⭐⭐⭐⭐☆ (4/5)