BOOST midsole Lace closure Take advantage of today. These running shoes use the latest innovations to keep you striding comfortably and confidently. BOOST delivers incredible energy return and instant comfort while an adidas PRIMEKNIT upper wraps the foot with a supportive fit that enhances every move. A Linear Energy Push system integrated with the outsole increases stability for extra responsiveness. This shoe's upper is made with a high-performance yarn which contains at least 50% Parley Ocean Plastic -reimagined plastic waste, intercepted on remote islands, beaches, coastal communities and shorelines, preventing it from polluting our ocean. The other 50% of the yarn is recycled polyester.