The Proteus II is one of the best performing wetsuits available on the market. 

Water ingress is minimised using Fourth Element's well know Hydrolock neck seal and Glideskin wrist seals to keep you warmer for longer. Thermal protection is enhanced by the seams being double glued, blind stitched and taped, massively reducing flow of water throughout the suit. Hexcore linings are also incorporated into the suit for extra warmth around the core of the body. 

This 3mm wetsuit is so advanced its warmth is often compared to 5mm wetsuits, only with greater flexibility and less buoyancy. 

Recommended by Fourth Element for water temperatures 23C and warmer, though it is used by many divers in cooler waters.