Material 2 layers of 304 stainless steel keeps heat extremely well.The lid of the bottle has a small gap to drink directly or plug in a straw, but the ability to keep heat is still great: Keep cold for 14 hours, keep hot for 6 hours. You can leave the whole ice intact all day and won't melt it all.4-layer structure, for outstanding heat retention: The lid has 4 layers, the outer and inner walls are made of stainless steel, the vacuum layer and copper coating, for high heat retention.
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