Vivobarefoot Primus Sport IV Preschool – Deep OceanGive little feet the freedom to move naturally with the Vivobarefoot Primus Sport IV Preschool Deep Ocean. Lightweight, flexible and foot shaped, these barefoot trainers are designed to help growing feet stay strong, stable and confident from daycare to the playground. Natural Movement for Growing Feet Built around Vivobarefoots foot shaped, zero drop design, the Primus Sport IV Preschool lets kids run, jump and climb with natural balance and posture.