Use polyester thread for sewing almost anything that requires strength and durability. It is strong, has excellent sunlight (UV) resistance, and is a great choice for sewing fabric, leather, canvas, and vinyl. It should be your first choice for sewing anything that is used
such as tents, patio furniture, sails, and boat and pool covers. Use the Size Guide at the bottom of this page to find your thread size (thickness).
Use Guide--This guide is an alphabetical list of things sewn with polyester thread and the range of sizes they use. Work backwards from the material that you are sewing to the thread size that you need. Remember, thread size usually increases with material thickness, and that your sewing machine's capabilities may limit your choices.