The adidas Ultra Boost 4.0 Grey is a performance running shoe designed with a stylish light grey color scheme. Featuring a Primeknit upper for breathability and flexibility, this sneaker is equipped with adidas' Boost midsole, ensuring equal energy transfer with every step. The Torsion System adds stability around the midfoot, while the FITFRAME 3D-shaped heelcap stabilizes the heel. The design is completed with a durable Continental rubber outsole. Launched in November 2017, these shoes are a must-have for any fitness enthusiast.