Adjustable Harness Lines The 20"-24" and 22"-28" are used for light wind course racing, for smaller people and light wind free sailing. The 26"-32" are used for extreme wave, free race or high wind course racing. Three convenient sizes: 20"-24", 22"-28", 26"-32" Features: Adjustable on the water. Quick release system. Two per set. Easy to fit on the booms