Can a Heated Wetsuit Actually Work for Cold Water Surfing?

From Michelin Man to Offensive Engineering

Why We Built a Heated Wetsuit That Actually Works

Wetsuits have come a long way.

The 6/4 modern winter suit is nothing like the old Michelin Man stiffness we grew up with. Materials are lighter. Stretch is better. Thermal linings are incredible.

The needle has shifted.

But still — every extra millimetre adds weight. Every layer adds restriction. Every winter you feel it in your shoulders after two hours of paddling.

We didn’t want to keep adding neoprene.

We wanted to remove it.

Early Attempts

We tried what was already out there.

Early heated solutions from brands like Quiksilver and Thermalution promised a lot. We tested both.

What we found:

• Too much hassle

• Inconsistent heat

• Surface heat to the skin — not real core warmth

• Constant fiddling with switches in the lineup

Most sessions became an exercise in wondering:

Is this even working?

Instead of focusing on waves, you were battling battery anxiety.

That wasn’t good enough.

Going on the Offensive

Most winter gear fights attrition.

More thickness.
More layering.
More compromise.

We wanted to go the other way.

Instead of defending against cold, we decided to attack it.

Testing began in winter 2023/24.

Soldering iron on the bench.
Breadboard circuits.
Chopped-up polypropylene vests.
Belts. Girdles. Mock textile stacks.

A few steps forward. A few steps back.

Heat too aggressive.
Heat too weak.
Wrong placement.
Wrong insulation.

Iteration after iteration.

The Breakthrough

By winter 2024/25 we had a working prototype.

The final push wasn’t electronics — it was textiles.

Layering. Insulation. Reflection. Redistribution.

Not just heat to skin — but heat managed through the core.

That winter we surfed the entire Scottish season in a 4mm wetsuit.

Not chasing a “hot patch.”

Not cranking switches in the lineup.

Just controlled warmth.
Automatic.
Reliable.

Why This Matters

Modern wetsuits are excellent.

But even the best 6/4 still adds drag. Still adds weight. Still adds fatigue.

If you can drop 1–2mm while maintaining comfort, the difference is real.

More paddle freedom.
Less shoulder burn.
Longer sessions.

That was the goal.

And that’s what HOT POTATO® was built to deliver.