It adopts a double layer structure, made of high-quality # 304 stainless steel, with vacuum and heat insulation treatment, providing excellent cold and heat preservation effects. The inner liner is integrally molded, and it is not easy to retain bacteria during electrolytic treatment. Novel design, patented hidden strap design, convenient and hygienic, fashionable color matching, youthful and beautiful, with unlimited vitality. It is the ideal choice for you to go out, work, and travel outdoors.