Double-Wall Vacuum Insulation: This Premium Insulated Shaker Bottle has been built with a double-wall design with an insulating vacuum layer in the middle. Made from Professional-Grade 18/8 Stainless Steel, keeping your drink at the perfect temperature for hours on end. Safe & Long-Lasting: Made from Stainless Steel, the inner layer of this shaker won't add any nasty tastes or harmful chemicals to your drinks. This keeps you safe, while the stainless steel outer construction of the bottle makes it incredibly long-lasting. Bringing convenience and ease to your supplements with our premium, insulated shakers. Designed to be simple to use and a breeze to clean, robust and a large 735ml capacity ensuring that you can use this shaker on the go. The double-wall construction keeps your shakes nice and cool! Easy-Twist & Leak-Free Lid: The lid on this shaker bottle has been designed with a unique short thread that makes it easy to simply twist the whole lid off while keeping it tightly sealed when it is attached to the bottle. A wide o-ring seal is included inside the lid, further improving the seal and creating a 100% leak-free design.