Polycotton is a fabric made from a blend of cotton and polyester, commonly used to make bed sheets and clothes. It is both durable and comfortable and has a variety of uses. Poly-cotton shirts do not cling to the body as cotton shirts do. A poly-cotton shirt is wove to allow air to circulate, keeping you cooler compared to the thicker cotton material. Couches, chairs and ottomans and car seat covers are may all use cotton-poly blends.