18/8 Stainless Steel Material: The insulated water bottle is made of food-grade stainless steel material, which is resistant to oxidation and corrosion, and will not have a metallic smell or rust. 100% safe for everyday use. Double Wall Vacuum Insulated: The water bottle is double walled with a premium coating on the outside of the inner wall for high performance insulation, keeping liquids hot for up to 12 hours and cold for up to 24 hours. IPX7 Waterproof: The water bottle reaches IPX7 waterproof level, which can be washed with confidence. The surface design of the water bottle is simple, the material is smooth, and it is very convenient to clean. Sealed and leak-proof: The lid of the water bottle contains a food-grade silicone ring, which is well-sealed and does not leak when shaken or inverted. Insulated water bottle is perfect for everyday use, running, hiking, camping and more.