Because of the Chinese size different from US size, when you purchase please according to your waist size, select the correct US size.
US Size Asian Size
S = L Waist 31.5-33.5(inch)Waist 80-85(cm)
m = xL Waist 33.5-35.5(inch)Waist 85-90(cm)
L = xxL Waist 35.5-37.4(inch)Waist 90-95(cm)
xL = xxxL Waist 37.4-39.4(inch)Waist 95-100(cm)