Two layers of stainless steel, with a copper inner coating and a layer of vacuum insulation in between, ensures that your drink keeps its temperatures, either hot or cold, for up to seven hours. The really cool thing about this mug is the push-button top that lets you drink from any side of the cup, no more figuring out where the "drink" side is when you're on the go. A no-spill silicone seal keeps drinks where they belong and you'll find no BPA anywhere. 15-oz. capacity.