Vivobarefoot Primus Lite Knit Natural Mens EclipseIF FEET COULD GROW SIX PACKS The Primus Lite Knits flexible knit upper, made with recycled plastics, adds even more mobility and agility to the beloved Primus Lite. The same 2mm Primus outsole, with an Active Ortholite Performance Insole made of 98% recycled PU foam, makes it perfect for active lifestyles and controlled workouts. With a sensitive 2mm Primus sole and a light, flexible knit upper for full natural mobility, the Primus Lite Knit is ideal