Timeless style made vegan. The classic adidas Stan Smith may have been an icon for the past 50 years, but that doesn't mean it can't change with the times. Initially a performance tennis sneaker, it didn't take long for this fashionable silhouette to transition to everyday wear. As part of adidas' commitment to using only recycled polyester by 2024, the iconic has gone sustainable, featuring vegan uppers and an outsole made from rubber waste and Primegreen, a series of high-performance recycled materials.