? Thermal-Locking Innovation: The food-grade 304 stainless steel inner lining efficiently blocks heat transfer, keeping hot drinks warm for around 6 hours and cold beverages chilled for up to 12 hours (actual performance may vary slightly by environment). ? Effortless Portability: Equipped with a leather strap, it enables seamless transitions between commuting, outdoor, and office scenarios. The airtight, leak-proof lid ensures no spills?even when flipped?so you can safely stow it in your bag. ? Two Stylish Color Options: The matte metal body comes in two sophisticated hues??Black-Gold? and ?Cream-Gold??accented with a metal ring at the base, exuding understated elegance. The ideal 400ml capacity is perfect for a single serving, cutting down on frequent refills. ? Thoughtful Details: The ergonomic curve fits comfortably in your palm; the smooth inner wall is easy to clean with no hidden corners for dirt buildup.