Description
- Frost King window insulation kit for interior use
- Energy saving efficiency to increase R-Values up to 90%
- 2 sheets measuring 62 in. x 210 in.
The Thermwell Products Co., Inc. 62 in. x 210 in. Polyurethane Extra-Large Shrink Window Insulation (2-Pack) helps improve the R-value of a single-pane window by up to 90%. The insulation features polyurethane construction.





























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