Description of Keen Sienna MJ Shoes - Women's The Sienna Mary Jane from KEEN is built with a trick—the stitches are hidden so all you see is style. The low profile outsole uses natural rubber and cork for an eco-friendly take on durability. The recycled polyurethane and cork footbed keeps your comfort on track. Features: Weight: 8 oz / 226 grams Fit Tip: We find this style runs pretty true to size. Rubber: Non-Marking rubber outsole Upper: Leather Low profile natural rubber and cork outsole Nubuck and full grain leather upper Stretch instep strap