When youre out in the elements at night there are enough hazards to navigate without worrying about losing sight of what youve got tied down. 2.5mm diameter Reflective Rope comes in 50' length, and is perfect for things like tent guy lines, hanging bear bags, boating, tying up tarps or shelters, and then being able to see where it is. Sturdy double braid nylon with a special reflective strip woven in that reflects brightly when light is shined on it.