ShockWave™2 is uniquely designed to expand and contract (6 ft. to 4-1/2 ft.), in reaction to a worker’s movements. The tubular web stays out of your way when not in use, avoiding trips and snags. A built-in impact indicator provides easy visual evidence if the shock has been impact loaded through a fall or improper use. It limits the average fall arresting forces to 900 lbs. (4kN).