English fashion designer, Stella McCartney, first began collaborating with the Three-Stripes brand in 2005. Offered up in February 2019, the Stella McCartney x Wmns UltraBoost 'White Black' sneaker features a flexible knit upper that's been reinforced on the sides and heel for added support. The shoe is bolstered by adidas Boost cushioning, made from expanded TPU pellets for a responsive feel, and a Continental rubber outsole.