adidas The adidas ZX franchise has always stood for the future. Starting as a running shoe in the ’80s, it’s driven by a desire for groundbreaking design and aesthetics. Almost 40 years later, the ZX 2K Boost Shoes are pure comfort and style, fueled by energy-returning Boost cushioning. Bright colors and graphics give this pair a fresh feel.This product is made with Primegreen, a series of high-performance recycled materials. 50% of the upper is recycled content. No virgin polyester.