Door Draft Stopper is a double sided insulating device for seal your door and window gap or crack. Keep the cold/warm air in your home and stop the draft from coming across the floor, helps with the heating and cooling bills, be more efficient. Simply slide under the door and it will instantly Instant protection from cold, drafts, insēcts and dust! FEATURE: Simple and effective Easy to install & use Moves with your door Works with any floor surface Open and close the door No need to constantly bend over to re-position Double sided = Providing double the protection Adjustable Door Gap Stopper Length - Adjustable 32 to 38 inches Diameter tubes - 1. 1 inches foam insert for covers gaps HOW TO USE? 1. Measuring the size of the door/window 2. Use scissors or knife to cut the foam to the exact size needed, fits doors up to 38" 3. Insert foam tubes into cover, and fold the excess part and paste it on the two magic strips 4. Slide double door draft stopper under door, complete!