Keep you warm by blocking out cold air during the winter months. It's also an outstanding noise reduction tool and can shut out light and odors. put one in your bedroom to help you sleep better.Adjustable & Easy to Install: The size of door draft blocker is 29"-32". It can also cut foam to fit 29"-32" doors. Just adjust the length and slide the door down.It can be used on interior doors, but not suitable for exterior doors with threshold.[Save Energy & Money]Using door draft stopper is to increase energy efficiency by reducing heat loss from the room, ATYARD draft stopper are designed to cover the gaps on the bottom of doors to keep outside cold air and drafts coming in. (and save energy bills simultaneously.)