Vacuum insulation provides optimum heat retention at least 9X longer. Will hold your beverage at the ideal drinking temperature at least 9X longer. Includes a leak proof screw on lid with a visual open/close push button locking closure. Featuring our patented designed lid that has lip and finger grooves that allow you to position the drinking spout without even looking. Lid can come apart for easy cleaning. Made of FDA compliant materials. 18-8 Stainless Steel dual wall with black matte finish a. 2.75" D x 2.75" W x 9.25" H