Total Draft Guard Energy Saver makes heating and cooling your home more efficient, saving you money. Simply slide the double-sided Draft Guard under the door. The door draft stopper is easy to install and stays in place. It works on all floor surfaces. It saves energy in the winter by preventing cold drafts and energy in the summer by keeping cold air in and hot air out. It can be used on exterior and interior doors of all types. The removable foam tubes can be cut to custom fit doors of all sizes. Fits doors and windows up to 36"