Design: Running shoes made in part with Parley Ocean Plastic PRIMEKNIT upper wraps the foot with a supportive fit Lace closure for a secure fit In-Shoe Comfort: BOOST midsole delivers incredibly energy return and instant comfort Fitcounter molded heel counter adds support Sock-like fit Durability & Traction: Stretchweb outsole with Continental(TM) Rubber delivers superior traction on a variety of surfaces Additional Details: Weight: 10.8 oz. Midsole drop: 10mm (heel: 25mm / forefoot: 15mm Yarn in upper contains at least 50% Parley Ocean Plastic and 50% recycled polyester