Purchase custom made sheet traveler lines for your main sail online here. Our in house riggers will splice your traveler line with the hardware of your choice, using the rope of your choice.
The traveler is used to trim the mainsail while maintaining leech tension. Because it is undesirable for the position of the traveler to move once it has been set, low stretch ropes optimise performance. Having said that small movements do not cause significant problems and so double braid polyester is acceptable where there are budget constraints.