It is near the connections not the velcro looking wire ties.PE sells it...it's nylon (I think) based sleeving that expands and contracts to cover the wires. Need to cut it with a hot knife (also sold at PE) so it won't unravel on you.
Provides good protection for the wires and keeps everything neatly together.
looks like it screwed in to teh back seat frame.Aj nice install did you screw that right into the cars chasis or just the carpet?