This is Asia Size,Generally speaking: M L XL XXL=US Size XS S M L(Reference only).
If you can't Select the correct size. You can leave a message in english, about your height ? CM and weight ? KG. Then i can help you to choose the right size.
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Attention: This is Asia Size, which is usually smaller than US Size. Please check the size chart carefully before you buy, one or two size bigger is better for you when you choose Asia Size.