3 Strand Pre-shrunk Polyester is used by many sail makers as a bolt rope. The rope is pre-shrunk using a special process so that it remains the same length when wet.
Polyester has a specific gravity of 1.38 which means it will not float. Polyester has no strength loss when wet, it is flexible and has good abrasion resistance. Polyester fibres also have good resistance to chemicals and have a melting point of 295°C.