High-elastic 3D stretch rebound TechLoom Upper dynamically woven to move with your feet. Strategically placed ventilation zones allow enhanced airflow to keep your feet cool and dry. Internal cage provides additional support and customizable lockdown while still allowing full range of motion. Phantom lace loop eyelet offers the option to tuck your laces for streamline look. Convertible design allows you to remove your laces completely, transforming your shoes into a slip-on while still providing great fit and support. Propelium® is designed to maximize energy generation and provide superior comfort that will maintain midsole structural integrity longer than conventional EVA. Lightweight Propelium® midsole. Durable rubber outsole with forefoot crash pad. The 8mm drop from the heel to the forefoot places your foot in a natural position for efficient running.