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The Proteus II stands out due to its advanced features like the Glide-Skin wrist seals, hydro-lock inner neck seal, and double glued, blind stitched, and taped seams. It also has Thermoflex and Hex-Core linings for superior thermal protection, making it perform more like a 5mm suit with greater flexibility and less buoyancy.
The Proteus II is designed for water temperatures of 23-degrees C (73-degrees F) and above. However, it has been used by divers in cooler waters due to its superior thermal protection.
The Proteus II features a back zipper entry with a zipper tab leash, making self-donning and doffing a breeze.
The interior of the Proteus II is lined with Thermoflex material throughout, providing exceptional comfort and thermal protection. The suit also features additional Hex-Core linings on the body core for enhanced thermal performance.
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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