Better Fit. The upper material has spandex for a more dynamic, improved fit than before. Still lightweight and soft, the upper is easy to collapse, so you can quickly slide the shoe into your tote or backpack.Upgraded Comfort. A wide strap wraps your heel for added support, better structure and a more secure fit. Padding in the heel adds another level of comfort.All Natural Movement. The soft, lightweight sole mimics your foot’s natural movement through its innovative pattern. It expands and contracts with every landing and push-off. This provides a natural feel and a barefoot-like sensation, kind of like an extension of your foot.Flywire cables work with the laces for more support as you tighten them.Rounded heel is made to roll with the ground as you stride.