This women’s Waffle Racer is a retro runner from the ‘70s made futuristic, in line with Nike’s environmental goals. It’s got the upper we all know and love — all nylon and viz panels, with a Swoosh patched on using zig-zag stitching for a deconstructed flom. Underfoot, however, the cushioning and tread are crafted from Nike Grind rubber, which repurposes scraps from the factory to create its flecked finish.