This is Asian size, which is 2-3 sizes smaller than EU / size If you wear European / American size M, you can choose our size XL or XXL. We suggest XL if you are a regular size M. Refer to item size chart. Measure your body first, then choose the correct size according to this product’s size chart. In between sizes? We recommend you size up. For a more relaxed fit, order one extra chart size up.