Copolymer / fluoro-coated nylon: Care and trade-offs
Water absorption, wear, storage and sunlight affect performance. Inspect actual condition rather than imposing one replacement calendar. A fluoro surface does not erase the nylon core's behaviour.
Copolymer / fluoro-coated nylon
Nylon blends and nylon with a fluorocarbon skin, sold as "copolymer" or "hybrid": thinner and stiffer than plain nylon, still a nylon in everything that matters — stretch, absorption, visibility.