With this innovative draught excluder, you can keep rooms warm and cosy while helping to reduce your heating bills. The Duo Draught Shield slides easily under your door and is double sided for double air leak protection. It also moves with the door, so there's no need to move or reposition it once it's in place. Made from expandable polyurethane foam, Duo Draught Shield not only blocks out cold air, it can also help reduce cooking odours and noise from creeping into your room. For use on internal doors only.