Amp up your glow Prom or Homecoming theme by offering these Nite Glow Water Bottles as a custom favor keepsake. Also great for an 1980s theme, the water bottle can be customized on one side with your choice of one-color imprint. The best part about this bottle is that glows in the dark! The glow effect is activated by exposure to light. The 17 oz. bottle is made of stainless steel and comes with a silver twist-off lid. Because this water bottle is vacuum insulated, it keeps liquids cold for up to 24 hours or warm for up to 21 hours. NOTE: Hand wash only.