New Balance Rubix Women's Running Shoes White/Steel/Guava : The New Balance Rubix running shoes feature a unique midsole construction for the runner who needs superior stability on the run. Data-driven guidance ramps are designed as part of a two-part midsole helping to improve overpronation. A light and breathable jacquard mesh around the upper provides comfortable structure and security. Limited rubber on the outsole helps facilitate an energized running experience. p> Upper: Engineered jacquard mesh and TPU fine mold encase the foot for enhanced support and security. Midsole: Data-driven guidance ramps from a two-part midsole help deliver premium stability and curb overpronation. Outsole:Solid rubber sections on the outsole are limited to keep the shoe light and nimble.