4'x100' IR Blocker RollNASA has designed the superior quality blocker roll for blocking unwanted light. It also helps reduce the heat signature and thermal imaging by 97%. The material of the blocker roll has been strengthened by bonding it to polyurethane. The blocker roll is highly durable, dependable, and ensures staying around for a pretty long time. The inner layer of the blocker roll ensures insulation and does not allow a conductive flow of heat.