This is specially flag industry manufactured pre-shrunk polyester cord. It would only shrink by a fraction over time or if washed, exposed to heat, sea water or temperature fluctuations. The pre-shrunk cord is specially woven and temperature treated. Regular non pre-shrunk polyester cord tends to shrink much over time if exposed to outdoor weather, hence can do damage to flag or other advertisement installations. Suitable for small up to 1yd flags or any other outdoor purpose where cord shrinkage is an issue.