Barefoot, minimalist, leather, ankle boots, black, zip up, very gently used, size 43 Materials: Upper: Premium leather Tongue: Non-gusseted Interior Lining: Microfiber Sole: 3.5mm thin, flexible rubber Barefoot Shoe Qualities: Zero Drop - Peerko Go boots are completely flat. Wide Foot-Shaped Toe Box - Lots of room for your toes to spread out. Thin, Flexible Sole - Flexible enough to allow for natural foot movement.