The 10 thumb tip shaped nodes on either side of its spine apply the same kind of pressure as a Shiatsu massage.
Lumbar Extender Plus Item Details from Relax The Back:
Lumbar Extender Plus
SKU: SMCI002
Description: The Lumbar Extender Plus offers all the same features and benefits of the original Lumbar Extenders, but with an added bonus: an extra trigger point massage top, which applies targeted pressure along your vertebrae to release tension and enhance muscle relaxation.