A genoa halyard should have a low elongation. This is required for properly trimming your sail: when wind increases, sail should stay flat. For regatta sailing we advice the ropes below.
This top quality high performance regatta rope, has a core made of coated Dyneema® SK78 fibers and 24 braid HT Polyester cover. Features: Suitable for splicing and tapering, very low stretch, light weight, great durability. Excellent for halyards.