CompositionDark gray: cotton 82.1% polyester 9.8% regenerated cellulose 8.1% (with trace amount of other fibers) Light blue: cotton 81.0% regenerated cellulose 11.3% polyester 7.7% (with trace of other fibers) Black: cotton 76.3% polyester 23.7% (with trace amount of other fibers) Black is a different article number of the same model