- new in box, all original packaging, never worn - Vivobarefoot (Vivo barefoot) Primus Trail Knit FG Mens - Obsidian Black - Size 10 Men's IRM GROUND OUTSOLE Stand firm on multiple terrains. ORTHOLITE INSOLE The Active Ortholite Performance Insole is made of 98% recycled PU foam, which helps reduce waste and the use of virgin plastics. TOUGH RUBBER COMPOUND Strong, non-marking rubber compound for sticky grip and high-abrasion when you need it most. VEGAN* *The main materials in all our Vegan* products are synthetic and aren’t derived from animals. We don’t (yet) have the transparency we need over the production of all the small components (such as adhesives and dyes) used in these products to ensure they meet vegan best practices. So, whilst we believe the shoes are vegan, we’re not yet able to guarantee it and want to be fully transparent. WEIGHT 400 g (Based on a single shoe in Men's size: EU 42 | UK 8 | US 9)