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The Proteus II comes with Glide-Skin wrist seals and a hydro-lock inner neck seal. Additionally, it has watertight seams that are double glued, blind stitched, and taped to keep water out.
The suit is equipped with Thermoflex linings throughout for excellent thermal protection. It also has additional Hex-Core linings on the body core for enhanced thermal performance during prolonged water exposure.
The Proteus II is designed to perform like a 5mm suit in terms of warmth and thermal protection, but with the flexibility and less buoyancy of a 3mm suit.
The Proteus II is recommended for water temperatures of 23-degrees C (73-degrees F) and above, but it's also known to perform well in cooler waters.
The Proteus II features a back zipper entry with a zipper tab leash, making self-donning and doffing easy and convenient.
Review Summary
Nylon 2 Neoprene Rubber
3mm
Double Glued, Blind Stitched & Taped
Back Zipper w/Pull Tab Leash
661708255187, 0661708255194, 0661708255279, 0661708255316, 0661708255293, 0661708255248, 0661708255231, 0661708255323, 661708255224, 661708255262, 661708255170, 0661708255255, 0661708255286, 661708255200, 0661708255217, 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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