The double-walled stainless steel construction creates a vacuum-insulated structure. This prevents condensation from forming on the surface due to temperature differences. 18/8 Stainless Steel Made with durable and rust-resistant 18/8 stainless steel, commonly used in tableware. Keeps drinks delicious and is easy to clean. BPA-Free Made with materials that do not contain Bisphenol A (BPA), which can be harmful to the human body. Unique Powder Coating The surface has a special powder coating, making it easy to grip and slip-resistant, even with wet hands. SPEC Capacity: 354ml Mouth Diameter: 58mm Body Dimensions (Width x Height): 74mm x 163mm Weight: 290g MATERIAL Body: Stainless Steel Lid: Polypropylene Gasket: Silicone Rubber Strap: Thermoplastic Elastomer Box not included. Bottle covers are also available.