Triple action galvanized karabiner allows the upgrade into a twin-unit. Top Swivel limits lifeline twisting and improves user experience. Super-tough nylon housing is lightweight, compact, durable and UV resisant. High strength polyester thin webbing is added for durability and longevity. Heat-shrunk clear PVC on shock pack is easy to read the label, easy to inspect, has improved durability and visual imapct indicator.