Built to the exacting EN1891 standard for static ropes, KMIII is the industry standard for rescue and rappelling operations. The kernmantle construction consists of a durable polyester cover over bundles of unidirectional nylon core yarns. The polyester cover absorbs less water, has lower stretch, and is more abrasion resistant than the nylon covers found on some static ropes. The polyester cover and nylon core are balanced during manufacturing to attain the ultimate in performance.