NEXUS KNIT – Athleisure Meets Barefoot-Inspired Comfort. When you take an athletic design and give it Xero Shoes DNA – lightweight, flexible, foot-shaped – and add a breathable, 3D-knit upper, you get the Nexus Knit. Whether you’re in the gym, taking a walk, going for a run or just hanging out with friends, you are going to love the look and feel of this shoe.