Marine Serre and Under Armour are releasing a debut capsule collection that puts the baselayer at the centre of the conversation. Launching 5 June exclusively on marineserre.com, at select Marine Serre stores, and through a pop-up in Paris running 5 to 7 June, the collection will expand globally later this summer on UA.com. The Paris pop-up at Rue de Turenne will create an environment where sport meets craft, inviting visitors into the world of the collaboration.

The partnership draws on Under Armour’s 30-year history and its archive of 2000s sportswear, with the baselayer as the natural starting point for both brands. For Under Armour, it’s the product that started everything, refined through decades of athlete feedback. For Marine Serre, it’s the house’s “Second Skin,” the Moon-patterned layer that anchors her creative identity. Marine Serre, a former professional tennis player, approaches design with the instincts of an athlete, and that shared language of movement and discipline runs through the entire capsule.

The collection is stripped back and direct. Lean lines and sharp black-and-white contrasts, crafted with Under Armour’s HeatGear, reflect the focus of sport at its highest level. A bespoke print merges Marine Serre’s Moon with Under Armour’s heartbeat logo, two symbols grounded in belief in progress. “Sport has always been part of my life,” said Marine Serre. “With Under Armour, I wanted to explore the beauty of movement through pieces that combine performance, precision, and beauty, starting from the baselayer, the closest element to the body and to the athlete’s experience.”

The UA Proto Speed II also returns from the late-2000s archive for the first time. A layered textile base, sculptural leather paneling, and a silicone Under Armour x Marine Serre logo on the toe and vamp keep its nostalgic DNA intact while moving it forward. Yuron White, SVP and GM of Sportswear and Collabs at Under Armour, added, “Whether in training or in design, progress comes from deliberate repetition and purposeful execution. Beginning with the baselayer felt instinctive. It’s where that process exists closest to the body, and where our two perspectives meet with clarity and authenticity.”