The Adidas SL Loop "Chromatech" is a completely new innovation. This revolutionary material has the ability to expand and contract like many other materials currently used on sneakers. But, Chromatech also changes colors based on these movements, and over time the color will shift solely dependent on how you specifically wear your sneakers. Check out the pics for more details. And, shop the Adidas SL Loop "Chromatech" in two different colorways/patterns now at Sneakerhead.