Thermacore® insulated steel doors are the ideal choice for premium construction and maximum thermal efficiency. This series of doors feature our sandwich construction of steel-polyurethane-steel as well as between-section seals with thermal breaks to reduce air infiltration. With several panel designs to choose from, these doors offer design flexibility, durability and thermal efficiency that will help keep your home comfortable in cold or hot climates. These premium insulated garage doors deliver maximum thermal efficiency and design flexibility. These garage doors keep design in mind and add comfort to your home by providing protection from air infiltration and temperature changes.