Masterline Spectra Fusion Barefoot RopeMasterline Spectra Fusion Barefoot Rope The Masterline Spectra Fusion Barefoot Rope is a 27. 5m (90ft) Spectra Fusion barefoot mainline, built from a 19. 5m main section plus three shortening sections at 3m, 3m, and 2m. Spectra Fusion construction takes stretch out of the line under barefoot tow loads, so input from the boat reaches the handle directly. The 19. 5m main length sets a standard barefoot tow distance, and the three drops at 3m, 3m, and 2m