Igloo Cellulose is a highly cost-efficient insulation material made with 85% post-consumer recycled newspaper. Igloo Cellulose Insulation acts as an effective protective shield to reduce the transmission of heat or sound. Made from 85% post-consumer recycled newspaper and biodegradable protective additives cellulose consists of loose small gray wood fiber texture smooth to the touch. It acts like a non-conductor of heat and sound waves.