Design: High-elastic 3D stretch rebound TechLoom Upper dynamically woven to move with your feet Strategically placed ventilation zones allow airflow where you will need it most Phantom lace loop eyelet offers the option to tuck your laces for a more streamlined look Convertible design allows you to remove your laces completely, transforming your shoes into a slip-on without losing support or fit In-Shoe Comfort: Internal cage provides additional support and customizable lockdown that still allows for free range of movement Lightwegiht Propelum® midsole is designed to maximize energy generation and provide superior comfort that will maintain midsole structural integrity longer than conventional EVA Durability and Traction: Durable rubber outsole with forefoot crash pad Additional Details: Weight: 7.1 oz. 8mm drop from the heel to the forefoot places your foot in a more natural running position