Dabond Bonded Polyester Sewing Thread #138 Tex-135 16 oz. 2,800 Yard (Black) Coats has excellent UV resistance for applications exposed to marine water and sunlight Unique bonding technology that safeguards against ply untwisting in zig zag sewing and can sew through many layers of heavily finished fabric Dual level lubricated finish for needle heat protection and smooth sewing Excellent bleach, mildew and rot resistance Coats is the only environmentally-friendly bonded polyester thread available in the market The industry standard for sail making and other outdoor and marine applications