The dimensions we measure ourselves sometimes have some errors, but they are always within 3cm. If you are at the boundary between two sizes, order the smaller size for a tighter fit, or order the larger size for a looser fit. If you still don't know which one to choose, please contact us and we are happy to assist you! Orders are usually shipped within 48 hours. If the order is not shipped within 7 days after purchase, it will be a pre order or waiting for restocking. Please allow 4-6 weeks for this process. Due to lighting and personal display reasons, there may be some color difference between the picture and the actual product. Please refer to the actual product for accuracy.