Guardian White Polydac Vertical Rope Lifeline Assembly - 75 ft.* This 75 ft. Polydac rope is 100% resistant to rot or mildew even if stored wet. * Polydac Vertical Rope Lifeline absorbs more energy than any other type of rope available today, 12 times as much as Manila and 50% more than polyester. * This Polydac Rope Lifeline has excellent resistance to alkalis and most solvents and provides good abrasion protection. * This vertical lifeline assembly includes a shock pack, a positioning device, and an 18"