Nike’s Waffle Racer needs little introduction. It’s been an icon of running and casualwear since its ’77 debut. This women’s pair, though, are a little different from rainbow we’re familiar with. And that’s because there’s a load of eco-minded materials throughout, from recycled twill across the uppers to Grind and Crater Foam — which are made using scrap waste from the manufacturing process — worked into that iconic waffle sole.