High performance built with a purpose. This shoe combines an energy-returning boost™ midsole with a Primeknit upper made from 95% Parley Ocean Plastic™. The Continental™ natural rubber STRETCHWEB outsole provides all-weather traction, while a full-length boost™ midsole is designed to help you run further with less fatigue. The laces, heel cap base, heel webbing, heel lining and sock liner cover are made of 100% recycled PET. The TORSION® SYSTEM bar, also from a renewable source, supports the foot’s natural flex from heel to toe. All Parley Ocean Plastic™ used to build this shoe was collected and recycled from the Maldives.