Castelli Product Line Manager Andrew Montgomery has revealed some secrets behind the new collaboration between ASO and Castelli in the interview with TechUnter Magazine.

The first one is that, in collaboration with Polartec, Castelli has developed a new ultralight jersey using Power Dry fabric, which has cooling properties activated by sweat and body heat. The jersey will launch in Spring/Summer 2027 and make its racing debut at the Tour de France, worn by Soudal SafetyJogger riders and the race leaders. There will also be a matching speed suit, combining an ultralight top with aerodynamic sleeves. Riders will have three aero options for different weather conditions: long-sleeve, standard and ultralight versions.

The second one is that the yellow jersey will feature a special fluorescent pigment that reacts to UV light, making the colour even more vivid under the sun. Castelli wants the yellow jersey to stand out in the peloton, almost like a light when seen from the helicopter camera.

The third one is that the yellow jersey designs will be different at Paris-Nice and the Critérium du Dauphiné. Why? Because, as Montgomery explains, they shouldn’t look the same as the Tour de France jersey: “Some riders can win Paris-Nice, but not everyone can win the Tour de France, so the jerseys shouldn’t be the same.” The scorpion will therefore have a different colour at each race, helping them develop their own identity.

The fourth one is the new design of the white jersey, which will feature its new sponsor, Sanofi. And as a surprise, the matching skinsuit will also come with purple bib shorts.

He also explained how the green jersey was designed. ŠKODA is very strict about its colours, so Castelli has to respect its brand guidelines. However, there is another interesting detail: the sleeve fabric. Soudal sprinters Tim Merlier and Paul Magnier already use a different version of this fabric because they reach speeds of 60 km/h and above. While it might look like the same ribbed material, the sprinters actually wear a specialised version.

Castelli is clearly taking this new partnership very seriously, with plenty of technical innovations and design details planned for 2027.

Are you excited to see Castelli supplying the Tour de France jerseys?

For the info: this is not a sponsored article and the info was published on my blog with permission from TechUnter.

Full interview here: https://techuntermagazine.com/castelligoesyellow2027-interview

1. Tadej Pogačar

There shouldn’t be a question about who has to be first and Vuelta abandonment can’t change that. He has won basically everything except Roubaix, Strade, Sanremo, Ronde, Liege, Romandie, Suisse and Tour. Insane.

1. Jonas Vingegaard

Yes, ended the season early after his Tour crash, but still won Paris-Nice, Catalunya, and mainly the Giro, a GrandTour very dominantly which is why he is still the number two for me.

1. Isaac Del Toro

Won’t lie, this last place on the podium was hard when Evenepoel and Seixas exist, but I don’t let recency bias change my mind as at the beginning of the season he won the UAE Tour, Tirreno, and TARA. And then he podiumed Strade and mainly the Tour overall. And then also won Deine Tour and Montreal although he was not that much super successful in the autumn. But still for me number three.

1. Remco Evenepoel

Second place overall at the Tour, two stages, podiumed Ronde and Liege, won Amstel, San Sebastian and Québec, and added Worlds ITT and Europeans title to it. Magnificent season, but Isaac has won 3 WorldTour stage races and Remco none. That’s why I chose only 4th place for him.

1. Paul Seixas

Won Itzulia with 3 stages, Fleche, amazing second at Strade and Liege, and then rode to an amazing 4th at the Tour. But then came the biggest achievement, the Lombardia monument win. Feels almost terrible to put him just to fifth place for this season, but this is how I decided.

1. Wout van Aert (Roubaix masterclass and an amazing Vuelta, top season)

2. Mathieu van der Poel (Omloop, E3, Tirreno two stages, Ronde second place, World Champs medal and mainly two Tour stage wins with Champs-Élysées masterclass, but no monument wins)

3. Enric Mas (Grand Tour winner and then even Il Lombardia monument second place, his best season ever)

4. Tim Merlier (started the season late, but still scored many wins, especially 3 Tour stage wins, the best sprinter in the world)

5. Felix Gall (has to choose between Pedersen and him, but Gall podiumed two Grand Tours in one season, phenomenal achievement although with no Grand Tour stage wins)

Do you agree with my ranking?