This is a set consisting of a "sleeveless shirt OP" and "center slit pants" made of cotton linen material. I only tried them on, and they have been stored at home. They still have the tags. Please refrain from purchasing if you are sensitive to such things. The main body uses "cotton linen" material, which is excellent in moisture absorption and durability. It's an item that combines the refreshing feel unique to "linen" with the softness unique to "cotton". Material: 55% Linen, 45% Cotton