Main features: - Double vacuum wall, made with Thermo 3D technology, ensures temperature retention for hot and cold beverages. - The walls are made of high-quality 18/8 medical stainless steel. The outer wall is coated with a hard shell powder. The material used does not absorb the taste of the beverage and does not impart a metallic flavor. - The bottle has a BPA-free plastic cap with a seal, making it completely airtight. The cap features a convenient holder that makes carrying the bottle easier. - It is compatible with auto grips. - Each product is marked with a code on the bottom. Register and find out which environmental project your purchase has supported!.