I've been working on them in snippets of time for the last couple of days. Two out of three are now complete - Yippee!! I followed the instructions with the exception of adding some pieced strips of coordinating fabric just for fun. It's essentially just a long bag that holds 2 pieces of plumber's insulation pipe. After inserting the pipe, the finished edge gets folded in and the whole thing slips right under the door.
You can see in the photo above that one foam pipe is on the inside and one is on the outside.
The door opens and closes easily and the draft stopper stays right in place.