4-layer construction that resists deterioration. Perfect for stock items! Less irritating shingling noise. This is an emergency sheet made of lightweight and compact aluminum-deposited polyester; The silver color reflects light and heat; It can also be used for heat and insulation; It can also be used for waterproofing and windproof; Product Size: Approx. 84.6 x 53.8 inches (2130 x 1370 mm); Product Material: Vapor-deposited polyethylene.