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Too late and I'm not a lot of help because my wife bought the mug, but it is double sided aluminum... very well insulated, keeps hot stuff hot and cool stuff cool... which is kind of a waste on me because I don't drink ice water and for the most part I don't drink hot coffee in the car (except for road trips.)
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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