Fourth Element Proteus II Womens 5mm Wetsuit

Ten years as the benchmark. Still the warmest suit in the water.

The Fourth Element Proteus II didn't earn its reputation by accident. Professional divers, cave explorers, and underwater photographers have trusted it for a decade because it simply outperforms everything else at depth. The 5mm women's version adds an improved fit that's easier to get on and off without sacrificing an ounce of that thermal performance — making it the go-to suit for prolonged dives in water from 65°F and up.

What sets it apart

• Hydrolock neck sealA second over-head closure works alongside the primary zip to dramatically reduce water ingress at the neck — the most common source of cold flushes.
• Hexcore torso liningDense thermal lining on the body core targets the area most vulnerable to heat loss during extended bottom time.
• Glideskin wrist sealsSmooth neoprene at the wrist creates a watertight barrier without the bulk, keeping warm water in and cold water out.
• Thermoflex lining throughoutStretch thermal lining covers the full suit beyond the core — warmth that moves with you rather than fighting your strokes.
• Taped, glued & blind-stitched seamsTriple-secured seams are fully waterproof — no needle holes, no leaks, no cold spots at the joins.
• Internal PU ankle seals & stretch knee padsSeals at the ankle keep the suit snug at every exit point. Ultra-stretch knee panels protect without restricting movement on the reef.

Pair the 5mm with a Thermocline vest and shorts underneath for colder conditions, or add a 3mm or 5mm hood when the thermocline drops. The Proteus II is designed to be layered — so your kit grows with the conditions, not the other way around.

The professional's wetsuit. Now in yours.