Monoline Harness Lines
Monolines have only one point of support on the boom. Placement is important to ensure a balanced sail, but these are much easier to move along the boom when compared to duolines.
Hard: black or white, depending on availability
Long adjustable harness lines with one point of support on the boom, Easy to adjust the length and position on the boom, even while sailing full speed on your foil. They can be as short as 22″ and long as 44″.
Also used by Kiran Badloe and Lilian de Geus both RS:X World Champion 2021.