Double wall? Check. spill-proof lid? Check. Recycled stainless steel? Check! This 16oz. mug is made of recycled stainless steel and keeps drinks hot for up to 12 hours and cold for up to 24 hours. The convenient, clear, press-on lid features a tight silicone seal. Beautifully styled with a silver-accented lip and geometric pattern. Hand wash only. Do not microwave.