The Primus Lite IV is a versatile performance trainer for running, workouts and dynamic day-to-day living that helps you move like nature intended. It&';s wide for natural stability, thin for natural feedback, and flexible for natural movement. Re-engineered with refined panels for improved manufacturing efficiency, it delivers the same true barefoot feeling with reduced production waste. 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. 171g Cleaning Brush off mud and clean with a dry cloth. Drying Remove insole and dry at room temperature. Keep out of direct sunlight and avoid intense heat source. Aftercare Clean with mild soap and water and allow to air-dry away from direct heat. Avoid prolonged exposure to water, salt, and harsh chemicals. WOMENS FOOTWEAR SIZE GUIDE FOOT LENGTH (CM) EU UK US 21.2 - 22.1 35 2.5 4.5 22.2 - 22.8 36 3 5 22.9 - 23.5 37 4 6 23.6 - 24.1 38 5 7 24.2 - 24.8 39 6 8 24.9 - 25.4 40 7 9 25.5 - 26.1 41 8 10 26.2 - 26.8 42 8.5 10.5 26.9 - 27.4 43 9 11