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 Durability & Traction: Continental™ Rubber outsole Additional Details: Weight: 10.8 oz. Midsole drop: 10mm (heel: 25mm / forefoot: 15mm