Selecting the correct polymer is critical for durability. For outdoor use (baseball backstops, soccer goals), prioritize High-Density Polyethylene (HDPE) or Nylon with UV inhibitors, as they resist sunlight degradation and moisture. For indoor use (golf simulators, gym dividers), Nylon is preferred due to its high impact resistance and superior 'break strength.' Always verify the denier or twine size (e.g., #21, #36, #60); higher numbers indicate thicker, stronger twine suitable for high-velocity sports like hockey or golf.