Bettli 3300Yards Glow In The Dark Embroidery Thread (White) 150D/2 Polyester Filament Thread ,Contains 3300 Yards of thread In Optical green color Glow in the dark threads are popular with joggers and trick-or-treaters, but a new trend is developing in embroidered baby and children's items. Coats Glow in the Dark pastel colors are beautiful in daylight, but turn out the light and watch the delight on your children's faces as they see the thread glow in a darkened room! 100% Polyester Glow quickly recharges when exposed to light. Glow in the Dark 100% polyester thread Machine washable and dryable