Glow in the dark and RETRO Reflective yarns work together to make this small diameter accessory cord visible in low light conditions. A phosphorescent sheath yarn will glow up to 10 or more hours after about 10 minutes exposure to a good light source. In addition, the silver RETRO reflective yarn in the sheath reflects light shined on it directly back to the source at 1,500 times brighter than white. Excellent use for tents or in other uses where a higher visibility cord would be useful at night.