Back in February adidas announced some big plans for their flagship Boost-cushioned running shoe, the Ultra Boost, with the Ultra Boost Collective. Transforming the shoe from a high-performance runner to a sophisticated fashion sneaker, the Ultra Boost Collective features re-imaginations of the shoe by collaborators Stella McCartney, Kris Van Assche, kolor’s Junichi Abe, and adidas Creative Directors Dirk Schönberger & James Carnes. Kicking off the collective is the just-unveiled version by Stella McCartney. Already a long-time collaborator with adidas, McCartney redesigns the upper of the Ultra Boost creating a stripped down take on the shoe. It features a black/smoked pink/eggshell color palette with details including mesh side panels and striped toes and heels. The Ultra Boost by Stella McCartney will be available for $295 on April 25 exclusively in London for the London Marathon and then will be available globally on May 8.