The long-sleeve MILLE GT S11 is built for one job: keeping you cool and protected when the sun is at its worst. It’s the lightest and most breathable long-sleeve jersey in the line, using full-length sleeves for UPF 50 coverage and a body made from the same hyper-wicking textiles Assos developed for its Racing Series.

The sleeves handle the sun. The torso handles the heat. The main panels move air constantly and pull moisture off the skin fast. It fits in the RegularFit silhouette, so you get room where you need it without sacrificing stability on the bike. One note: the body fabric is so light that Assos still recommends sunscreen underneath. That’s the tradeoff for true hot-weather performance.

It’s a long-sleeve jersey built for days when most riders reach for a short-sleeve and regret it an hour later.