Work hard with Dickies' FLEX Regular Fit Straight Leg Double Knee Work Pant. While adding Flex fabric to these, we add longevity and durability, so you can hold on to these pants longer. This fabric is made of a mechanical stretch twill which consists of 65% polyester and 35% cotton. Put your iron away because these pants resist wrinkles. Stains are no big issue either with our easy-care stain release and moisture-wicking technology.