Nike Air Max 2021 Td 'Flat Pewter Siren Red Elastic Laces Size 9C Condition: Preowned Great Condition. see all photos for details an condition We went into the lab to redesign the Air technology in the Nike Air Max 2021 from the ground up. We put our best people to work and tested a new Air element with a collapsible cage that gives feet bounce like never before. It combines our most important elements and is light, durable and revolutionary. We also designed this shoe with the planet in mind. It is the definition of innovation for the next generation of Air Max. The elastic laces make it easy to put on and take off the shoe. Soft foam underfoot provides lightweight cushioning. The rubber sole guarantees durable traction. Pull tabs on the heel and tongue make it easier to put on and take off the shoe.