Are the Stainless Steel Water Bottles insulated? June 14, 2022 20:12 Updated Follow Yes, our stainless steel bottles are double wall insulated. Related articles How long do the Stainless Steel Water Bottles keep water hot or cold for? How often do I need to change my filters? What is the difference between having an Alkaline Ionizer to purify water as compared to a Reverse Osmosis (RO) Water Purifier?