Oct 23, 2026 

Every man on the podium at the 2026 IRONMAN World Championship started his day in the same swimskin: the deboer Tsunami 4.0.

Vincent Luis won. Gustav Iden was second. Matthew Marquardt was third. Two of them race for Team deboer. The third, the new world champion, has no deal with us. He picked the Tsunami 4.0 anyway, on the biggest day of his career, in what he had called his final race.

We can't think of a better endorsement than that.

A Kona to remember

On October 10, 2026, the men's and women's IRONMAN World Championships returned to Kailua-Kona on the same day for the first time since 2019. The men's race delivered one of the most dramatic finishes in years.

The swim set the tone. Kailua Bay was rough enough that some pros reported seasickness, and times ran well behind recent years. Marten Van Riel led the men out of the water in 48:17, about two and a half minutes off the course record.

Magnus Ditlev led onto the run after a 4:06:47 bike and held the front for most of the marathon, then faded and did not finish. Vincent Luis stayed patient, moved clear in the Energy Lab, and crossed the line in 7:47:27 on his Kona debut. He is the first Frenchman to win in Hawaii.

Gustav Iden came within 1:35 of the title despite serving a drafting penalty that held him at the start of the marathon. Matthew Marquardt took third after fighting back from a bike penalty of his own.

Splits from the TRI247 full finishing order; official IRONMAN results may differ by a second or two.

Three swims, one suit

You can't win Kona in the water, but you can lose it there. All three podium finishers made sure they didn't.

Matthew Marquardt, 3rd. The former Princeton swimmer was third out of the water in the Tsunami 4.0, right in the lead pack. Marquardt is a surgical trainee at Ohio State, and four years ago he was the fastest age-grouper in Kona. He has raced deboer since his early pro years, including the Tsunami 3.0 in Kona in 2024.

Gustav Iden, 2nd. The 2022 IRONMAN World Champion has been a deboer athlete for years. He came out of the swim in 50:09, then produced the fastest run of the podium, a 2:36:57, to finish second and win the 2026 IRONMAN Pro Series title and its $200,000 bonus. It's his second straight runner-up finish at the IRONMAN World Championship for Team deboer, after second in Nice in 2025.

Vincent Luis, 1st. The two-time short-course world champion swam 48:30 in the Tsunami 4.0 and was tenth out of the water, perfectly placed for the long day ahead.

They weren't alone. deboer supported 11 pro men in the field and had more athletes in the top 10 swimmers than any other brand. 

The champion who chose it

Marquardt and Iden are Team deboer athletes. Vincent Luis is not. No contract, no obligation, no logo clause.

Luis came to Kona with a lot riding on one day. It was only his third full-distance race, his first in Hawaii, and he had billed the season as his last. A swimskin was one of the few things he could control completely, and he could have worn anything. He chose the Tsunami 4.0.

That's the kind of result that matters most to us. A sponsored athlete wearing our suit tells you we believe in them. An unsponsored world champion choosing it on race morning tells you the suit earned its place.

What's inside the Tsunami 4.0

The Tsunami 4.0 is built around one idea: less drag in non-wetsuit water.

• Tridium (3Dium) fabric. Developed in Milan with a leading performance-swimwear mill, it has a hexagonal 3D texture, a layered scale array that draws on our X-Skin technology. It works the boundary layer to delay flow separation, which cuts drag.
• Seams that follow the water. Seams are placed and oriented along the direction of travel to reduce drag and improve comfort.
• A subtle lift. The base fabric and coating add a light buoyancy at the hips and legs while leaving the shoulders free.
• A refined fit. Version 4.0 keeps everything that made the Tsunami 3.0 fast and fine-tunes the fit, in the same signature color as the Fjord 4.0.
• Made in Italy. Men's and women's cuts, $399 USD.

The Tsunami 4.0 was on the fastest man in the water at the 2025 World Championship in Nice. A year later, it swept the Kona podium.

Your race, same suit

The Tsunami 4.0 the podium wore in Kailua Bay is the same suit you can race in. If your next start line is a non-wetsuit swim, check sizing and availability and join the waitlist for your size.

Congratulations to Vincent, Gustav and Matthew, and to every athlete who finished on the Big Island.

Sources

• The Swim Gear of the Leaders at the 2026 IRONMAN World Championship (Slowtwitch)
• IRONMAN World Championship 2026: Men's full finishing order (TRI247)
• How Matthew Marquardt bounced back to take third (Triathlete)
• Women's Tsunami 4.0 product page (deboer)
• Gustav Iden athlete page (deboer)
• 2025 End-of-Year Round Up (deboer)
• The Tools of the Top 10 Pro Men Swim Splits at the 2025 IRONMAN World Championship (Slowtwitch)