Our best-selling barefoot training all-rounder, now re-engineered for smarter material use. The Primus Lite IV delivers the same trusted barefoot feel with recycled, vegan* materials - made for moving naturally, whether you&';re running or working out. Wide, thin and flexible to elevate every workout, now with a lighter footprint. Primus Outsole Get as close to the ground as possible. Ortholite Insole The Ortholite Performance Insole is made of 98% recycled polyurethane foam, which helps reduce waste and the use of virgin plastics. Breathable Mesh Breathable, lightweight and comfortable. 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.