The ESP Door Seal Automatic Hinged is made from extruded aluminium it helps keep your home warmer in winter and cooler in summer. It helps to plug gaps under doors eliminate energy loss and reduce your gas and power bills. As homes settle and move slightly over time, gaps can develop. These gaps let cold air in during winter, and hot air in summer. Similarly when we use heaters and air-conditioners, these gaps let warm air out in winter and cool air in summer, costing us money. The ESP Door Seal Automatic Hinged is easy to install with screws supplied so you can start saving money today.