Yes, you can refrigerate HydroFlask bottles, and they will not damage them.
TAL bottles are made from stainless steel. They have an inner and outer wall, and in between the two walls is a vacuum with no air inside it. The vacuum allows for maximum heat transfer when cooling or heating liquids.
This means that if you put ice cubes into one of our insulated products (like Water Bottles), they should stay frozen longer than other containers because there’s no way for any heat to escape until they melt through those insulation layers.