Fabric composition: light grey: 90% cotton, 10% polyester Other 19 colors: 100% cotton 100% cotton, only light grey is 90% cotton and 10% polyester Size description: There is a 1cm-3cm error in the manual measurement of the size, which is within the normal range. It is suggested to choose clothes according to the actual size according to the size chart. If you like to wear loose, please choose a freshman size.