With a 304 stainless steel interior, food-grade material provides pure space from the root, is easy to clean, has no residue, safer. Vacuum insulation material can keep the beverage at a low temperature for 24 hours or a high temperature for 12 hours. Hand-polished rounded spout fits your lips for comfortable drinking without cutting your mouth. Recessed bottom design, easy to place smoothly. Every detail is wonderful, defining quality with details. Delicate straw with anti-drop ring, more convenient to use.