60% cotton/ 40% polyester; Roomy relaxed fit through seat and thigh; 5 belt loops double-stitched for reinforcement; Welted back pockets with button enclosures; Premium cotton-rich ringspun fabric for added comfort, breathability and strength, rinsed for softness; The color number refers to the waist size in inches, while the size refers to inseam length in inches; Size 39US is a 39 inch unhemmed inseam