The Nike Free Flyknit+ ($160) will never be the most protective shoe on the planet, but will slide across your foot with the comfort of a intense hiking sock that will deliver a sole-less walking experience.  It starts as a sock around your ankle and makes its way into a running shoe when you get to the sole.  An incredible design gradient built for the future, shown in this aqua blue hue to get a better look at the intricate stitch pattern and design.  It comes in a few colors, and they are taking pre-orders at their site.