The D-Core Pillow is named for the D shape in the center. The D-Core Pillow provides proper cervical support, leading to restful sleep. This orthopedic fiber pillow’s patented D-shaped center gently supports the head and neck during sleep to help remedy many common ailments, including tension headaches, neck spasms, arthritis and snoring. Suitable for both back and side sleepers, the D-Core is filled with cool and comfortable Corefill® 100% polyester fiber. Non-allergic Corefill® polyester fiber. 24”x 16”.