Vacuum insulation provides optimum heat retention at least 10X longer. Lid can come apart for easy cleaning. Features lip and finger grooves that allow you to position the drinking spout without even looking. Patented designed lid. Will hold your beverage at the ideal drinking temperature at least 10X longer. Includes a leak proof screw on lid with a visual open/close push button locking closure. Made of FDA compliant materials. 18-8 Stainless Steel dual wall, Copper lined vacuum insulation. Complies with FDA. 3" D x 3" W x 9.25" H