Because of the Asian size is about 1 size smaller than US size.
For example: usually the Asian Tags "M" is equal to the US Size "S", and our item tag is printed in Asian size only

• Our briefs made in China. The select tag is Asian size. Size:US XS=(Asian S On tag) Waist:26-30nch , Size:US S=(Asian M On tag) Waist:31-34Inch , Size:US M=(Asian L On tag) Waist:35-38Inch,Size:US L=(Asian XL On tag) Waist:39-42Inch
• Min Rise,Elastic waist
• 85% Nylon, 15% Spandex
• Machine Wash - Cold (30¡ã max)
• Comfort Soft,Cool and comfortable feel

Our briefs made in China. The select tag is Asian size. Size:US XS=(Asian S On tag) Waist:26-30nch , Size:US S=(Asian M On tag) Waist:31-34Inch , Size:US M=(Asian L On tag) Waist:35-38Inch,Size:US L=(Asian XL On tag) Waist:39-42Inch