Stainless Steel dual wall with black matte finish and Copper lined vacuum insulation, which provides optimum heat retention at least 9X longer. Patented designed lid. Features a lip groove that allows you to position the drinking spout without even looking. Including a leak proof screw-on lid with a visual open/close push button locking closure. Lid can come apart for easy cleaning. Available in a variety of 13 different colors. Made of FDA compliant materials. Hand wash only.