Polyester combines many of the benefits of both polypro and nylon without some of the negatives. It has a 3800 lb breaking strength, low water absorption, rot and mildew resistance, and has 5 times the abrasion resistance of polypro with a softer feel. (not as soft as nylon). The 1 inch polyester is perfect for cam straps and ratchet straps. All of our Polyester is made in house, therefore it is "colorfast" and will not bleed.