The FootFitter Sensomatic Plastic Boot shapers are patented with Sensomatic technology that was developed in Germany. This unique and proven design will gently hold your boots in shape. It has two-sided plastic pieces that are attached by a center bracket that uses the sensomatic mechanism which guarantees that your boots are kept in shape with the right amount of tension. These boot trees automatically adjust to a preset tension that keeps your boots in shape and does not break the leather or make them too loose. The center piece also has a convenient handle that can be used as a boot hanger. Comes in 3 different lengths.