Natural fiber ropes are hygroscopic, so they soak up water. When wet, the moisture causes the fibers to swell and the fiber structure to become more plastic, which lowers tensile strength. Water also reduces the friction between fibers inside the rope, so strands slip more under load, making the rope weaker. The rope becomes heavier and less stiff, further decreasing its ability to carry a load safely. Because of these effects, it loses strength when wet, rather than gaining strength, becoming buoyant, or drying instantly.

Dynamic rope is designed to elongate under load, which absorbs a significant portion of the energy in a fall. That energy absorption lowers the peak force experienced by the climber and the rope system, making a fall less sudden and reducing the risk of injury and equipment failure. Static rope, by contrast, stretches very little, so it transmits most of the fall energy as a sharp shock load. In fall-arrest situations you want that energy to be dissipated gradually, not dumped all at once, which is why dynamic rope is preferred. The other ideas—stretching to absorb heat, being weaker or thinner, or being used only for hauling—don’t describe how these ropes function or are used in rescue or fall-arrest scenarios.

The main idea is choosing a knot that provides a secure, easily inspectable tie-in when you need a long leg to the harness. The figure-eight follow-through fits this need because you can form a figure-eight on the rope and thread it through the harness attachment points, then back through the knot to create a long, controlled tie-in. It holds well under load and is straightforward to retrace and undo, which makes inspection and adjustment reliable. A backup stopper can be added to prevent the tail from slipping, increasing security for a long tie-in. In contrast, a bowline around the harness can loosen under load if not perfectly dressed; a clove hitch can slip or shift; and a water knot is meant for securing webbing ends, not tying into a harness. Therefore, the figure-eight follow-through is the best choice for a harness tie-in with a long tie-in.

The Water Knot is used to join two ends of webbing to form anchor slings. This knot is designed specifically for flat webbing, not for rope, so it’s ideal for creating an anchor sling by connecting the ends of the webbing and forming a secure, compact join that can be clipped into or tied to anchors. It isn’t used to tie rope to rope or to secure a rope around a post, and it isn’t a method for finishing rope ends to prevent fraying.