Meet the ICEMAN 4.0 cold water wetsuit
You know the feeling. The water drops a few degrees, your hands go numb before the first buoy, and the group chat quietly stops planning swims until spring. It doesn't have to go that way. With the right cold water wetsuit, those crisp, empty, glassy mornings become the best swims of your year. That's exactly what we built the ICEMAN 4.0 for.
Here's what it feels like to swim in it, how to build your kit around it, and how to get the matching hooded vest free this season.
Why your regular wetsuit gives up in the cold
Most wetsuits are built for speed in mild water. Once you're swimming below about 15°C, two things start working against you.
First, cold water pulls heat from your body much faster than air does. Second, it finds every gap. A loose neck, an open wrist or a bare ankle lets cold water flush through the suit with every stroke. Your head, neck, hands and feet lose heat fastest. Cold extremities tell your brain the whole body is cold, so you tense up, your stroke shortens and the swim gets cut short. A true cold water wetsuit has to keep the warmth in and the water out.
What you'll feel in the ICEMAN 4.0
The ICEMAN 4.0 is our warmest wetsuit, and it still swims like a race suit.
- Warm from the first minute. Our ThermaFur lining reflects your body heat back to you. It also dries fast, so it's lighter in the water than a traditional thermal lining.
- Shoulders that don't fight you. Ultra-flexible 1.5mm shoulder panels mean a warm suit doesn't cost you your reach or rotation.
- A stronger catch. 5mm Propulsion Forearm panels help you hold the water, even when it's cold.
- Fewer ways for cold water to get in. Single-seam construction and longer legs with ankle zippers let your gloves and socks tuck under the suit and seal.
- Built to last. Our OC Skin coating resists the nicks and marks that shorten a wetsuit's life.
- Easy to spot. The high-visibility design, inspired by our NORSEMAN roots, makes you easier for kayakers and safety crews to see.
It's approved for Ironman, ITU and ETU racing, so the suit you train in all winter is the one you race in come spring.
Head to toe: building your cold water kit
The ICEMAN 4.0 is the heart of our cold water system. Add the pieces you need as the water drops, and the full kit keeps you swimming down to 6°C / 43°F.
- The Polar Hooded Vest goes under your suit and seals warmth around your head, neck and core. We designed it with the Norseman Xtreme Triathlon science team.
- Polar Gloves keep your hands warm while still letting you feel the water on the catch.
- Polar Socks slip inside the suit's ankle seal to keep your feet from going numb.
Not sure what you need? Match your kit to the water:
|
Water |
Your kit |
|---|---|
|
Cool, early season |
A Fjord or Tidal wetsuit, plus the hooded vest on chilly race mornings |
|
Cold, shoulder season |
The ICEMAN 4.0 |
|
Winter |
The full system: ICEMAN 4.0, hooded vest, gloves and socks |
See the whole range on our cold water page.
Tested where it counts
In 2025, Ross Edgley became the first person to swim the entire coastline of Iceland, in deboer swim tech. That's about 1,000 miles over 114 days, from May to September (ExplorersWeb).
The water was usually 3°C to 5°C and almost always rough. Storms kept him on the boat for days at a time, and a hurricane hit in the final week. He kept going.
You probably aren't planning to swim around a country. But it's good to know your suit was built for the North Atlantic.
Getting the fit right
In cold water, fit is warmth. A suit that's even slightly loose lets water flush through, so it's worth getting right.
- It should feel snug on land. Think of a firm handshake everywhere. It loosens up in the water. It's only too small if you can't take a deep breath or raise your arms overhead.
- Size up on gloves and socks if you're between sizes. They run small.
- Take your time putting it on. Start with dry skin and use the pads of your fingers, not your nails. Nail nicks are the most common way wetsuits get damaged.
Still unsure? Our fit team will help you pick your size for free, and every order comes with free 30-day returns and size exchanges.
Looking after it: after each swim, soak your suit in lukewarm fresh water for at least 5 minutes, then rinse it. Store it flat. Small cuts can be fixed with a dab of wetsuit glue.
The hood's on us
If you've been putting off cold water, this is the easiest way in.
Get the ICEMAN 4.0 for $899 and we'll add the matching Polar Hooded Vest free. That's the suit and the hood for the price of the suit alone. The offer ends November 30. After that, the vest is sold separately.
