The outer and inner layers of this double-layer car vacuum bottle are made of 201 stainless steel and 304 stainless steel respectively. The bottle body is corrosion-resistant and has excellent thermal insulation performance. It is a star-level product. After the sublimation process, it has various colors for you to choose. Perfect for on the go and fits perfectly in a car cup holder. Keeps your beverages warm for 6 hours and cold for 12 hours. Condensation-free surface.