Lifejacket - With Harness The description "With Harness" simply means that lifejacket is built with a substantial stainless steel "D" ring incorporated into the webbing. This offers the wearer the option to attach a safety line from the "D" ring to the boat. Not only reassuring but highly reccommended by all safety authorities. In a Man Overboard situation, contact with the boat should be maintained. At the very least , when the weather becomes grim, this type of jacket offers the user the choice to connect a safety line.