Vivobarefoot Primus Lite 3 Running Shoes Vivobarefoot's Primus Lite 3 Running Shoes have a minimalist, flexible design that encourages natural movement. More foot than shoe shaped, these trainers are wide for stability, with a 4mm Active sole that is ideal for hard surfaces, delivering traction and durability. Sustainable materials ensure the impact on the planet is minimised, and all are free from animal products and not tested on animals at any stage of manufacture. The upper recycled polyester mesh is water-resistant for all-weather performance.