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The Proteus II is unique due to its advanced features such as Glide-Skin wrist seals, Hydro-Lock inner neck seal, and Thermoflex and Hex-Core linings. These features provide superior thermal protection and comfort, allowing the 3mm suit to perform on par with 5mm suits.
The Proteus II features watertight seams achieved through a meticulous process of double gluing, blind stitching, and taping. Additionally, it has a Hydro-Lock inner neck seal and Glide-Skin wrist seals to prevent water ingress.
The Proteus II offers exceptional thermal protection thanks to its Thermoflex lining throughout the suit and additional Hex-Core linings on the body core. These elements provide enhanced thermal performance where it's most needed during prolonged water exposure.
The Proteus II features a back zipper entry with a zipper tab leash, making it easy for self-donning and doffing.
While it is ideal for water temperatures of 23-degrees C (73-degrees F) and above, its exceptional thermal performance has been known to serve divers in cooler waters as well.
Review Summary
Nylon 2 Neoprene Rubber
3mm
Double Glued, Blind Stitched & Taped
Back Zipper w/Pull Tab Leash
661708255309
Fourth Element Men's Proteus II Full Wetsuit Size Chart
| XS | XSS | S | ST | SS | M | MS | MT | L | LS | LT | XL | XLS | 2XL | 2XLS | 3XL | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Height (ft/in) | 5'5"-5'8" | 5'3"-5'6" | 5'7"-5'10" | 5'9"-6'0" | 5'5"-5'8" | 5'9"-6'0" | 5'7"-5'10" | 5'11"-6'2" | 5'11"-6'2" | 5'9"-6'0" | 6'1"-6'4" | 6'1"-6'4" | 5'11"-6'2" | 6'3"-6'6" | 6'1"-6'4" | 6'5"-6'8" |
| Chest (in) | 35-37 | 35-37 | 37-39 | 37-39 | 37-39 | 39-41 | 39-41 | 39-41 | 41-43 | 41-43 | 41-43 | 43-45 | 43-45 | 45-47 | 45-47 | 47-49 |
| Waist (in) | 29-31 | 29-31 | 31-33 | 31-33 | 31-33 | 33-35 | 33-35 | 33-35 | 35-37 | 35-37 | 35-37 | 37-39 | 37-39 | 39-41 | 39-41 | 41-43 |
| Inside Legs (in) | 30-31 | 29-30 | 31-33 | 33-34 | 30-31 | 33-34 | 31-33 | 34-35 | 34-35 | 33-34 | 35-36 | 35-36 | 34-35 | 36-37 | 36-37 | 37-38 |









The Proteus II is a worthy successor to the original Proteus suit by Fourth Element. Available in 3mm thickness, the Proteus II is set to redefine the warmest suit in its class. Water ingress is minimized by a number of design features. Glide-Skin wrist seals and the now famous hydro-lock inner neck seal combine with watertight seams which are double glued, blind stitched and taped to keep the water out. Thermoflex linings throughout the suit provide excellent comfort and thermal protection. Additional Hex-Core linings on the body core provide enhanced thermal performance where it is most needed for prolonged water exposure.
The 3mm suit is probably the only 3mm in the world to feature such advanced features, allowing it to perform more like other 5mm suits with greater flexibility, and less buoyancy. Fourth Element recommends water temperatures of 23-degrees C (73-degrees F) and warmer, but they know of many divers who take it into much cooler waters. Suit has a back zipper entry with zipper tab leash for easy self-donning and doffing. The Proteus II is available in multiple sizes.
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