Double-walled and vacuum sealed stainless steel keeps contents hot or cold for over 12 hours. Does not sweat when filled with cold beverages nor burn your hand when carrying hot. Contoured design - makes the bottle easy to hold and visually distinctive. Unsurpassed testing for material safety to insure they do not contain toxic chemicals. The removable mesh filter keeps ice from blocking the drinking spout and allows users to conveniently brew loose leaf tea or make campfire coffee. Features both a wide-mouth opening for easily filling with ice and a narrow-mouth for spill-free drinking.