Upper: Stretchy, breathable mesh that keeps your feet cool and comfortable all day long Shoe body: No fastening device required, you can simply wear it Shoe width: If you have bunions, index fingers, wide legs or a high back, please choose one size up Sole: Non-slip PVC sole, safe, comfortable and durable, indoor or outdoor walking without burden Applicable places: Casual daily, hiking, jogging, work, sports, travel, fitness, light indoor training