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I popped this into my beach bag for a sunset picnic and my prosecco was still crisp and cold two hours later. The flute shape somehow keeps the bubbles going way longer than a regular tumbler.

Kept my sparkling wine cold through an entire dinner outside, which never happens with regular flutes. The chilled design really does what it says.

Took this to a rooftop party and my champagne was still cold an hour later, which never happens with regular glass flutes. The lid actually seals tight so I didn't lose any fizz on the drive over.