Shao Wei 4. The sole of Shao Wei 4 is designed with a crystal outsole. If it's wearable indoors, it's still good. Shoes have a strong grip on the ground, which is better than Shao Wei's 5. The outsole material of Shao Wei 4 domestic version is different from that of foreign version. The domestic version has XDR soles and hard rubber soles, so it is hard and wear-resistant, which is also the reason why many people dislike the soles being too hard. However, this kind of sole is more suitable for outdoor concrete floor.