The Spark Mina is a cute ballet flat featuring a shiny toe post and bow accross the vamp. Leather upper. Firm yet flexible, removable microfiber-covered EVA orthotic insert. TPR outsole. Biomechanically designed to hug your arches, FMT Technology helps support natural alignment from the ground up. To preserve the appearance of your Vionic shoes, we recommend that you clean the leather, if needed, using a dry, cotton cloth to wipe away dirt or dust. Keep leather footwear away from direct heat to prevent the leather from drying out. If your shoes or sandals become wet, please allow them to dry naturally. We recommend that you test any cleaning product by applying a small amount to a discrete area and allowing it to dry. Do not use cleaners which contain acid or detergents, as they may damage and prematurely age the leather.