Xero Shoes Prio Barefoot Running Athletic Shoe Lunar 15. The Prio is the most comfortable shoe for everything you do. Whether you’re out on a run, trying out a new trail, hitting the gym, or toeing a slackline, you’ll love the Prio’s combination of freedom and protection. Revel in the freedom of movement with a breathable design and lightweight construction. Natural Fit. Natural Motion. Natural Feel. The optional 3mm insole lets you have more or less of a “barefoot feel” depending on your mood. Prio is made from 100% vegan-friendly materials. Brand recommends ordering regular size. Great pre-owned condition. Please note light discoloration as shown. Smoke/pet free home. Offers welcome. Bundle & save. Ship same/next day. Packaged w/ care.