B-Quiet Hliner Thermo/Acoustic Foam with a Reinforced Aluminum Skin 12.75 Sq. Ft. Hliner is 1/2" thick thermo/acoustic foam with a reinforced aluminum skin. It reduces engine noise in the interior of the vehicle and also reflects the majority of the heat from the engine. This protects the paint on the hood and keeps it looking new. Hliner should be cut to shape and then applied to the underside of the hood. It is self adhesive to make installation quick and easy. Each sheet measures 54" x 34" for a total of 12.75 sq. ft. and weighs 3lbs.