What protects our astronauts from 400 degrees of Heat on the sunny side of the moon and -300 degrees Cold on the dark side? Aluminum foil. Aluminum foil literally stops the transfer of heat. That's why, today, it is used in literally thousands of product packaging ... from candy bars to potato chips ... to keep them from being destroyed by heat. Goodbye, High Energy Bills! - Over 90% of the heat gains in summer and heat losses in winter are right through the ceiling. Stop the heat, stop the meter. ATTICSHIELD is sheets of aluminum foil designed especially to create a thermal barrier in your attic... keeping heat from entering your home in the summer, or escaping in the winter. Made from two sheets of 99.5% pure aluminum sandwiching polypropylyne threading for strength, ATTICSHIELD - when laid right over your existing insulation - stops 95% of heat in your attic from coming into your house.