Puma has teamed up with the BA fashion course at Central Saint Martins (CSM), the London-based design school, to study sustainable technologies in textile manufacturing. The result is a “Day Zero” collection that consists of new takes on the RS-X3, Future Rider and Ralph Sampson Low shoes. Designed by CSM’s students, the footwear is inspired by the threat of water shortages in today’s world. “Day Zero” refers specifically to the water crisis that has affected Cape Town, South Africa, since 2015. The term is the name the city’s authorities gave in 2017 to the future day when the water level of the major dams supplying Cape Town would fall below 13.5 percent, and force them to switch off municipal water supplies. Serious challenges in sustainable water supply persist, but the city has managed to avoid the disaster so far.