A mug featuring a beautifully-accented cork wood bottom. Features: *Double wall, vacuum insulated 18/8 stainless steel tumbler with powder coated finish.*Copper-lining keeps drinks cold for up to 24 hours and keeps drinks hot for up to 12 hours.*Comes with a convenient clear lid with a spill-proof seal. Eco Friendly Bottles - Free Of Single Use Plastics*We have now eliminated all single use plastic packaging materials on our powder coated reusable bottles.