Try This: Draft Stopper

Stop cold air with this homemade draft blocker.

Step 2: For the back, cut another strip of felt in a contrasting color (here, loden green) that’s about an inch wider and longer than the black piece. Line up the black front on top of the contrasting back, leaving about 1/2 inch of the back fabric exposed all around the edges. Machine stitch all the way around, leaving the top edge open to add the filling.