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4 ft x 125 ft (500 sq ft).

This insulation product consists of 1 layer of 5/32" (4mm) polyethylene bubble that is sandwiched between two metalized, low emissivity surfaces. The R-value ranges from 4.9 to 14.1 (See "Technica data" tab below) . The polyethylene encapsulated air bubbles serve as an effective thermal break as well as a vapor barrier, while the 2 outer metalized layers reflect up to 96% of all radiant energy.
Tape seams to improve insulation performance - Important. Order reflective tape.