Double-walled and vacuum-sealed. Keeps contents hot or cold for hours. * Perfect of hot or cold beverages. Does not sweat (for cold contents) or burn your hand (for hot contents). * Contoured design. Makes the bottle easy to hold and visually distinctive from the many, many straight-walled bottles available. * Removable mesh filter. Keeps ice from blocking the drinking spout and allows users to conveniently brew loose leaf tea or make campfire coffee. * Unsurpassed testing for material safety. Our products undergo rigorous chemical and biologic testing to insure they do not contain toxic chemicals.