APL Streamline Women's Warm Silk/Ice Blue/Tie Dye Keep moving forward, as fast as you can. With a design that allows excellent airflow, the APL Streamline increases speed and easy movement with every stride. Slide into the APL AeroLux upper to stay cool and comfortable during the miles. Enjoy smooth transitions on the APL Future Foam midsole, with superior compression and energy return to propel you forward. Top it off with a durable rubber outsole for reliable traction, and the APL Streamline supports your adventures! Shoe Technology Upper: APL AeroLux upper combines a lightweight woven textile with thin support layers and vector flow lines to improve airflow and durability. Strategic areas of reinforcement provide support and ventilation where you need it most. Integrated lacing structure lets you customize your fit. Microfiber collar and 3D molded heel padding reduce friction and increase comfort. APL Souffle sockliner provides superior cushioning and step-in comfort similar to a recovery shoe. Midsole: APL Future Foam midsole provides exceptional compression rebound and energy return. Features horizontal channels carved by the wind to make each stride flow smoothly through the air. Slanted, forward-leaning shank plate is sandwiched between the two-piece midsole to promote a forward roll at foot strike. Outsole: Lightweight, two-piece rubber outsole adds traction to support your adventures. Sizing Important Sizing Note: We recommend you size up at least a half size in the APL Streamline. For example, if you normally wear a size 8 athletic shoe, choose a size 8.5 instead.