Polyester is a strong, durable fabric that dries quickly and resists creases. Due to its strength and abrasion resistance, it's used for tent flysheets and inners, making for a strong ,waterproof tent that will last for years. Polyester is also used in clothing and is ideal for lightweight, durable clothes for hot climates. Its durability and crease resistance also means that the fabric is easy to care for and simple to wash.