WATER BEAR TACTICAL vacuum-insulated water bottles are made of high-quality food-grade 18/8 stainless steel, protecting the quality and temperature of the stored liquids. The heavy-duty interior coating repels lingering flavors to enable constant reuse without any after-tastes. Keep Liquids Hot For Up To 12 Hours: You can now take your coffee, hot drink or even hot soup with you on the go. Keep Liquids Cold For Up To 24 Hours: The bottle will keep its contents cool such as freezing cold fluids or ice cold for up to 24 hours.