Imprint Method: Silkscreen, Imprint Method: TruColor, Imprint Method: Laser - 18-8 Stainless Steel dual wall, Copper lined vacuum insulation Deep draw liner for a more permanent vacuum insulation. Vacuum insulation provides optimum heat retention at least 7X longer. Patented Features lip and finger grooves that allow you to position the drinking spout without even looking. Includes a leak proof screw on lid with a visual open/close push button locking closure. Lid can come apart for easy cleaning. Features a stylish rubber grip to keep your hands from slipping. Made of FDA compliant materials.