"The Prio uses the same 5.5mm FeelTrue® rubber as our Z-Trek sandal, so you get great protection while still getting the ground feedback that your feet love. The optional 2mm insole lets you have more or less of a “barefoot feel” depending on your mood. A women’s size 7 is only 7.3 ounces each – you’ll barely notice you have them on.
Plus, the Prio is made from 100% vegan-friendly materials."
"All Xero Shoes feature a wider, foot-shaped toe box that lets your toes spread and relax, a non-elevated “zero drop” heel for proper posture, low-to-the-ground design for perfect balance and agility, and a flexible sole that gives you “just right” protection so you can bend, move, flex, and safely Feel the World® in total comfort."
Note from Xero: Xero resized the Prio on July 31st, 2019. If this style used to fit you in a size 9.5, then a size 9 should fit you now.