Vivobarefoot Primus Knit Wool Toddlers ShoesSHOP USA Overview Vivobarefoot Primus Knit Wool Toddlers Shoes gives growing feet the space and sensory feedback they need. Vivobarefoot's kids range is built on the same barefoot principles as the adult line wide toe box, zero drop, thin flexible sole but sized and tested for children. Primus knit wool is a tough, high performance shoe designed for wild little feet. Developed in collaboration with The Woolmark Company, this is one of our best