The pillow is designed with two compartments. One compartment holds fill that supports your head and another smaller compartment along the bottom edge holds a patented cylinder-shaped support for your neck. The head support compartment is filled with one of the most luxurious man-made fills available. Polysilk® is hypoallergenic, feels soft like down but is more supportive. The smaller neck support compartment is accessed with a zipper. This compartment allows for changing out the support to configure to your preference, or to replace as needed.