A revolutionary new security product, Block-IR is made from NASA developed Infra-Red blocking technology. The two outer layers of Block-IR material reduce thermal imaging heat signatures by 97%. Each layer if Block-IR material is bonded to a durable layer of polyurethane for strength. An inner layer of insulation prevents conductive heat flow. An additional layer of polyurethane gives Block-IR high reliability and strength. Completely line any space with Block-IR for a 97% reduction in thermal imaging reduction. Don't be fooled by thin, cheap imitations that don't provide complete protection. This is the real deal. Accept nothing less. Foil tape is required for proper installation.