The adidas Ultra Boost Undefeated Performance Running Gray is a running shoe that was designed in collaboration with the Los Angeles-based streetwear brand – Undefeated. The Ultra Boost Undefeated Performance Running Gray features a breathable knit upper with a Shift Gray colorway, accented with Utility Black accents. The Boost technology midsole provides exceptional energy return and cushioning, which is essential for all runners. This shoe also features a lightweight cage that wraps around the midfoot for maximum support and stability, while the Continental Rubber outsole is designed to provide optimal traction on both wet and dry surfaces. The shoe is engineered with a PRIMEKNIT upper that provides a superior fit and optimum breathability. The PRIMEKNIT material is a soft, flexible, and stretchable fabric, made with advanced weaving technology to ensure maximum durability. It conforms to the shape of the foot, providing a snug and customized fit. The shoe was made available on November 9th, 2018, at a retail price of $220.