There are two kinds of lifelines: horizontal and vertical. Here we have the top choices from 2015 for the vertical systems.
Vertical Lifelines usually take the place of lanyard in the fall protection world and come in much greater lengths.
French Creek's Vertical Lifeline with Thimble End is constructed of 5/8" 3-strand polyblend synthetic rope for excellent wear and tear, strength, and limited stretch. It also available with snap hooks French Creek's Vertical Lifeline with Hook Ends. Both come in multiple lengths to best fit your job.
Guardian Blue Poly Steel Vertical Rope Lifeline Assembly is ideal for damp or wet environments and is resistant to abrasions and Ultra-Violet light damage.
FallTech Vertical Lifeline is a 5/8" premium polyester rope that is abrasion and UV resistant and includes a snap hook and a braid-end.
Super Anchor Fall Arrest Lifeline Assembly uses the lightweight Super Grab to arrest a fall within inches even in the grimiest of conditions.
Miller Polyester Blend Rope Vertical Lifeline is specially designed for abrasion resistance. The 5/8" diameter rope also includes a locking snap hook on one end and loop on the other.