Adidas ULTRABOOST S.RDY running sneakers A special version of UB20, the mesh monofilament is fused with the PRIMEKNIT upper to enhance ventilation and cool the feet. TFP provides precise support and 360° PRIMEKNIT knit upper to enhance the running experience in an all-round way. Seamlessly integrated knit upper with PRIMEKNIT, providing precise support, mesh monofilament fused with PRIMEKNIT upper to enhance ventilation and cool feet. The 3D hollow heel provides stability and support, which is both weight reduction and stylish and beautiful. The one-piece ultra-thin retractable design tongue is easy to put on and take off, and fits the ankle to provide a full range of wrapping experience.