Don't be left in the dark! This thread is made of reflective material so it pops in the night when light hits it. Embroider with it alone or add as an accent to existing stitchery. Keep it fun and safe: This thread is not safety rated, and should not be relied upon as your only nighttime safety garment. It should be used for fun, eye-popping embroidery accents on cycling gear, scarves, tops, hats, Halloween costumes...