Are Starbucks stainless steel tumblers insulated? - Ecoway Houseware

Product Description

Are Starbucks stainless steel tumblers insulated? The Starbucks Stainless Steel Tumbler has a double-walls of stainless steel 18-8 to keep your drinks hot or cold for hours. This is possible because of the tumbler is vacuum insulated, which is responsible for the temperature retention.

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