This Aura Systems ACAURB25 IR blocking and shield reflector is a revolutionary security product. It is made with infra-red blocking technology from NASA, also referred to as "Block-IR". This shield protector comes in a 25-foot roll and has two outer layers of Block-IR material, reducing heat signatures by 97 percent. The blocking and shield reflector has two layers, one for strength and one to prevent conductive heat flow, and each layer bonds to a durable polyurethane layer for strength. Foil tape is required for proper installation.