The Primus Lite III is our hero barefoot trainer with its minimalist design and its wide toe box, it lets your feet move in the most natural way possible. Primus lite III is built for strength for every run, walk, and workout. Feel the ground beneath your feet, whether you are running, deadlifting, doing tai chi, weightlifting, or simply walking. Primus lite III keeps you grounded.The Primus Lite III is a tried and true all-rounder barefoot shoe, encouraging runners to use and strengthen their feet when running as well as providing barefoot stability on the gym floors. The Active Sole offers the most sensory underfoot experience, providing ultimate grip and durability on hard surfaces in urban environments. The signature 4mm thin non-slip sole puts the minimum material between your feet and the ground.WIDE to allow for healthy foot spread and natural stability, THIN to enable you to feel more and move skillfully, and FLEXIBLE to build foot strength to enable natural movement.