adidas and Stella McCartney introduce their Ultraboost 21 silhouette executed in a White / Core Black/ Vivid Red makeup. This model features a textile upper with an inner sock, synthetic overlays, and Stella McCartney branding on the side panel. Its topped with elasticated laces, a Boost midsole, and a synthetic outsole. The adidas by Stella McCartney WMNS Ultraboost 21 - White / Core Black / Vivid Red is now available at Kith shops and online.