18-8 dual wall Stainless Steel with Copper-lined deep draw liner, Lid can come apart for easy cleaning, Patented, Leak-proof screw-on lid with visual open/close push button locking closure, Black powder-coated body with silicone band accent, Vacuum insulation provides 11X heat retention, Lip groove allows for drinking spout to be positioned without even looking, Silicone band accent available in 15 different colors, Lead-free vacuum seal,