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How can the Frigid Rigid keep ice for so long?

April 26, 2017frigid Ice rigid

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How can the Frigid Rigid keep ice for so long?

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The three design features that contribute the most to the efficiency of the Frigid Rigid are (1) the fiberglass construction, (2) two inches of high density foam insulation and (3) the “D” ring airtight seal which keeps outside air from leaking into the box.