A good clothesline must be strong, have low stretch to prevent sagging under the weight of wet clothes and be durable to withstand the elements and the constant travel over pulleys. Polyester offers the ideal combination of strength, low stretch and abrasion resistance. In some cases, where extra weather protection is required, a plastic coating can be placed over the rope. Cotton is a widely used natural fiber rope that is often used in the forms of small twines and cords. It is soft, pliable and easy on the hands. Due in part to its medium strength characteristics, cotton is an excellent choice for a wide variety of common household uses, including the kitchen, garden, for blinds, crafts or for package bundling.