Self-Rescue features a patent-pending EZ-Link D-ring to simplify connection, a secondary rescue ring for assisted rescue, and a sealed, padded package to PRO ect the descent Device from damage during use. In an effort to ensure reliable performance in the field, Self-Rescue has gone through rigorous testing. The sealed design allows the PRO uct to perform as expected after it has been soaked in water for two hours and frozen in temperatures of negative 40 degrees Celsius. With 50- or 100-foot versions available, the self-rescue Device is among the most flexible and adaptable ever created.