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Amazon reviewers had quality control problems, so I tested mine immediately with 180° F hot coffee and they worked as advertised: no heat transferred to my hand, no leaks, no sweating. Molding is not as clean as Bodum’s double wall glasses which cost twice as much. Evil Senator/Vice President Robert Kinsey in Stargate SG-1 drinks his whiskey from these. Don’t let that put you off. Good price for what it is.
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