How does this pillow reduce Frozen Shoulder and Rotator Cuff pain?

The Better Sleep Pillow is made of 100% urethane memory foam and its unique design with a recessed portion for your arm along the entire length of the pillow and through the underside, allows you to sleep in a position that is most natural for your body. This recess provides support to your arm, head and neck, eliminating pain caused by frozen shoulder or rotator cuff injuries, alleviating numbness and tingling, or arm sleep that can occur during the night. Its contoured shape helps to distribute forces away from the shoulders and arm, allowing your arm to rest unrestricted, without the weight or strain that comes from resting your head directly on the surface of your arm.