The Mitchell ascending system is an adaptation of the original Jumar ascending system used by climbers and mountaineers. It was developed by caver Dick Mitchell in the late 1960s and the original chest harness with carabiner was later changed to a double chest roller to improve efficiency. The climbing motion is very similar to the alternating steps of the Ropewalker system except that the ascenders ride a bit higher and must be advanced by hand. It isn’t quite as efficient or fast as the double-bungee Ropewalker system, but is easier to cave with, easier to use for mid-rope maneuvers such as crossing rebelays or changeovers, and the most efficient system for down-climbing rope. It’s a good alternative to the Frog system for use with alpine rigging for cavers with body types that make the Frog system inefficient or uncomfortable.