We advise that you do not put your EMBR Shaker in the refrigerator or freezer.Our double-insulated products were designed to keep your beverage from being affected by outside conditions. This means if you put them in the fridge, it will not change the temperature of the liquid. Putting our products in the freezer can ruin them and voids the warranty. We recommend chilling your beverage to the desired temperature before using your EMBR Shaker!