XLS is a Samson cordage used for halyards. It is low stretch and has a shinier finish. TRO is short for Trophy Braid, which is also a Samson product used for sheets. It has a fuzzier or rougher feel, which aids in a better grip in your hands for trimming sails and wrapping around winches. XLS can be used for sheets too, but not so Trophy for halyards. Samson is a great product, BTW.
Barnacle Bill’s answer is spot on. You don’t need to use Sampson XLS or Trophy, but a decent low stretch halyard of the correct length and diameter are important. And the rigging chart helps you figure out what you need.
I have purchased lines right here from SBO, and from Cajun Ropes. But there are many places to purchase quality lines. It pays to shop around when you know what you want.
You can save a few $$ on halyards if you learn to splice your own on, or use a halyard knot. I just replaced my spinnaker halyard, and had to cut off the eye splice and shackle (don’t ask me why)…. So, instead, I just used a halyard knot to secure the shackle. Works great. and I will be able to swap the ends around at some point in the future (the part in the mast stays pretty pristine while the parts outside the mast get pretty crusty, worn and ugly).
Hope you are getting out this weekend! Nice weather inChicago this weekend for sailing! headed out this afternoon with friends for a little sail and a swim.
Greg