This Do it Best extra strength indoor window insulation kit is twice as thick as standard film. So, it's ideal for applications near high traffic areas. Twice as thick to resist accidental punctures. And twice as thick for increased R-value. The crystal clear plastic sheet shrinks tight and wrinkle-free with an ordinary handheld hairdryer. Easily installs on metal, painted, varnished wood or vinyl clad window frames with the double-face tape provided.
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