These Color Sense standard pillowcases at 100% cotton with a percale weave that results in a smooth matt comfortable cool finish. The standard size is generously cut so they fit our larger pillows. They came two in a pack with a clever package made from similar cloth material to protect the environment from all the plastic packaging we usually see. Nice touch. We washed them before the first use and the label says they get softer with every wash. Label says they are Oeko-Tex standard 100 certified to be free from harmful chemicals and substances which sounds good since they are next to our face for hours at a time. We got the white color to go with any sheets, but they come in multiple colors and matching sheets, comforters, duvets, etc. Overall a quality comfortable product that should last a long time.