This short sleeve polo shirt is made of sea island cotton, called "Gossypium Barbadense". This yarn is grown exclusively in the Caribbean islands of the British West Indies. WEST INDIAN SEA ISLAND cotton is handpicked and contains the longest fibers in the world. Resistance, brilliance and silkiness are guaranteed by the fineness of the fiber (the micronaire around 3.0). Rigorous control systems guarantee the authenticity of the raw material.