Mia will use one of these boards for the length of the shelter. She knows she wants the length of the shelter to measure 3.25 feet. She will use a different board for the width of the shelter. The width of the shelter will be shorter than the length.

What is the width of the shelter, measured in feet?

The problem states that the width of the shelter will be shorter than the length, so the width will be smaller than 3.25 feet. However, the exact value of the width is not provided in the problem. Therefore, we cannot determine the width of the shelter without further information.