Leading the industry with unmatched density and strength, all Hörmann urethane models have our environmentally friendly, 100 percent CFC-free, proprietary polyurethane (PU) blend foam core insulation. The 450U offers our highest level of insulation, followed by the more cost effective 440U, and the 425U, which in addition to outstanding insulation performance, includes Hörmann’s exclusive FingerGuard™ pinch resistant section joints.