Madre's Stainless Steel Mug

Madre's Stainless-Steel Mug  16.9 ounces (500 mL) Copper vacuum insulation, stainless steel accent, clear acrylic push-on lid with swivel closure, handle, and powder coated finish. Superior insulation:  The copper plating on the inner wall is an extra line of defense against temperature transfer. Heat escapes much slower so your hot coffee stays hot even in a snow storm, and heat enters much slower so your ice water doesn't melt even under a blistering summer sun.