谢谢，是什么制的？合成革的还是皮的？
Thank you. What are they made of? Are they synthetic or leather?
聚氨酯合成革生产中，为了降低成本，改善性能，经常在涂层浆中添加填充剂纤维素粉末等。
The materials, such as calcium carbonate, cellulose powder, are often used as additives in manufacture of polyurethane leather for reducing the cost and improving the properties of products.
鞋的顶端部分就是鞋面，通常由皮革、合成革或者是材料的组合。
The top portion of the shoe, or the upper, is usually made of leather, synthetic leather, or a combination of materials.
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