SUNGUARD is twisted and bonded through a state-of-the-art bonding and dying process, to ensure the highest quality of colorfastness and performance. Every SUNGUARD product is manufactured to meet anti-wick standards, which reduces seam leakage. Each production lot is tested to meet or exceed the QTN Quality Assurance standards. Bonded polyester outdoor thread is perfect for sail and canvas work. Sunguard polyester Bobbins has high strength and stretch control, stability in sunlight (UVR), resistance to needle heat, abrasion, salt-water and mildew. This polyester Bobbins is very seldom frays at the needle eye, and the consistent bonded finish minimizes the need for continual machine tension adjustments. Perfect for use on sails, tents, boat covers, awnings, outdoor canvas covers, and tarps.