It's Asian size,please check the detail sizer on the size chart image.
<br />100% Brand New.
<br />Material: Cotton Blend
<br />3 Colors: Yellow, Red, Blue
<br />Collar: O-Neck
<br />Sleeve: Long Sleeve
<br />Style: Graphic Tees
<br />Pattern: Print
<br />Occasion: Casual
<br />Package Content: 1 x Men T-Shirt
<br />Note: As different computers display colors differently, the color of the actual item may vary slightly from the above images, thanks for your understanding.
<br />Size: Asian size is about  2-size-smaller than US size, so make sure you have checked the following chart before purchasing: (please allow 1-2cm differs due to manual measurement, thanks)