"The Nike Lunarstelos Women'S Running Shoe Features Deep Outsole Flex Grooves And Dual-Density Cushioning For A Natural Ride And Lasting Comfort. Perforations On Both Sides Give You Excellent Airflow During Your Run. Mesh Upper Enhances Ventilation Dual-Density Midsole Delivers Plush Comfort Hot-Knife Cuts In The Midsole/Outsole For Flexibility No-Sew Overlays And Heel Molding For Structure And Support"