Our large pillow provides the largest area of support. Use it as your everyday ("night") pillow, for neck, shoulder, hip, knee support, or any way that is most useful to you. The PillowEase® case is made with 100% cotton, 500 thread count Sateen. Our fill is made of upcycled post-consumer synthetic fill. The large size is 24" x 24". It comes with one pillowcase in either white or blue.