•Stainless Steel Outer & Inner walls •Copper-lined •Double-wall vacuum insulated •Keeps your drinks hot or cold for hours (can keep cold more than 18 hours and keep hot more than 8 hours) •Bamboo - Naturally heat and bacteria resistant •Bamboo - Eco friendly - 100% renewable resource •Spill-resistant slide lid w/ rubber gasket •BPA-Free •Sweat-resistant •Ships assembled •Hand wash recommended