Fourth Element Proteus II

At a glance

Fourth Element Proteus II is a wetsuit from Fourth Element, rated 4.6 out of 5 and placed 5 of 26 in our exposure suits shortlist. Its defining number is material: Yamamoto 39 Neoprene. It scores hardest on bench performance (94/100) and softest on packed weight (56/100). The clearest advantage divers report: excellent flexibility across shoulders and back.

What the wetsuit actually gives you

Where it wins and where it costs you

Full review: Fourth Element Proteus II

The Fourth Element Proteus II is a semi-dry wetsuit built for divers who demand serious thermal protection without sacrificing the flexibility and range of motion that a true semi-dry design promises. Constructed from high-density, limestone-based neoprene, the suit resists water absorption and compression at depth, meaning it retains its insulating properties dive after dive rather than degrading over time like standard neoprene. The signature glideskin seals at the neck, wrists, and ankles create a genuinely watertight barrier that minimizes flushing, keeping a thin layer of warmed water against the skin and dramatically reducing the cold-water intrusion that plagues typical wetsuits. This makes the Proteus II a favorite among divers who explore temperate and cooler waters where a full drysuit feels like overkill but a standard wetsuit leaves them shivering by the second dive of the day.

Beyond thermal performance, the Proteus II is engineered with the practical realities of technical and recreational diving in mind. The suit features articulated paneling at the knees and elbows for natural movement, along with a smooth skin chest panel that improves core warmth retention in a zone particularly vulnerable to heat loss. Fourth Element uses their own blend of neoprene that remains supple even in colder temperatures, avoiding the stiffness that can restrict finning technique or make donning and doffing a frustrating chore on a rocking dive boat. Reinforced knee pads add durability for divers who kneel on rocky or coral-strewn substrates, while the back zip entry system, complete with a long pull cord, allows for independent suiting up without requiring a dive buddy's assistance every time.

Available in both men's and women's specific cuts, the Proteus II acknowledges that body shapes differ significantly and that a properly fitted wetsuit is central to both comfort and thermal efficiency. The women's version includes a tailored torso and hip contour, while the men's cut is proportioned for a broader shoulder-to-waist ratio, and both are offered in a wide range of sizes to minimize the gaps and bagginess that lead to water flushing. Divers who spend time in the 10 to 20 degree Celsius range consistently praise the suit for extending their bottom time comfortably, whether they're exploring temperate reefs, kelp forests, or wreck sites. As a mid-layer option between tropical-weight suits and full drysuits, the Fourth Element Proteus II fills a critical niche for scuba divers who need adaptable, dependable thermal protection without the added complexity and cost of drysuit diving.