If you really mean “glow in the dark”, that’s different from reflective cord. Reflective cord only “glows” when it with a light beam. Glow-in-the dark usually means the cord, or zipper pull, sort of absorbs sunlight (or other light source) and glows, for everyone to see, until the effort wears off (minutes or hours). It is not as effective as reflective cord because if you have to get up at 3 AM, by that time the glow on glow-in-the-dark cord is gone where reflective cord is always ready to “light up” when you shine a light beam on it.