- Stainless steel vacuum insulation keeps beverages hot or cold for hours - Leak-proof*, gasket-free, one-piece lid is easy to clean and prevents the loss of parts. (*When used properly according to the instruction manual) - The twist-off lid makes the drinking experience more like drinking from a regular cup - Rounded bottle opening is smooth and comfortable to the touch when drinking and cleaning - A special manufacturing technique was used to make the body ultra-lightweight and compact - 1-5/8” (4cm) wide mouth opening accommodates full size ice cubes and is easy to fill - Easy-to-clean nonstick coated interior - Made of BPA-free plastic and stainless steel