【High-Sealing Bottle Cap】 The cap allows air to escape slowly from a small gap when loosening the lid, preventing sudden gas explosions. 【High Heat and Cold Retention】 The double-walled vacuum construction maintains the temperature of your drink and prevents condensation, making it comfortable to carry. In addition to the double-layer vacuum technology, the inner surface of the bottle is coated with copper to further enhance heat retention. 【Uses High-Grade Stainless Steel】 Made of high-grade stainless steel, which is particularly resistant to rust and odors. It does not spoil the flavor of your drinks, and after finishing your drink on the go, it is easy to clean with a quick rinse, making it hygienic and reusable. Free Shipping Instant Purchase Available First Come, First Served Please refrain from purchasing if you are sensitive to used items.