The Hydro Flask Travel Coffee Flask is made from durable stainless steel, preventing flavor transfer and keeping beverages hot or cold for hours. Its double-wall vacuum insulation ensures drinks stay cold for up to 24 hours and hot for up to 12 hours, thanks to TempShield technology that prevents condensation and heat transfer. The leak-proof Flex Sip Lid offers convenient one-handed sipping and is compatible with other Hydro Flask lids. Designed for travel, this insulated flask fits in most backpacks and car cup holders. The powder-coated finish provides a non-slip grip. Hydro Flask offers a lifetime warranty against manufacturer defects.