The Nike Air VaporMax 2021 Flyknit ‘Grey Light Liquid Lime’ adds neon accents to a lifestyle runner built with at least 40% recycled content by weight. The upper is composed of breathable grey Flyknit with translucent green TPU on the toe cap and external heel counter. Buoyant cushioning arrives via a full-length VaporMax unit made with approximately 50% recycled materials. Underfoot . the rubber outsole incorporates Nike Grind . made up of post-industrial manufacturing scraps.