The uniquely shaped, Original Wonder Disc positioning support pillow provides comfortable, yet firm support between the legs to help relieve sciatica pain, joint pressure, pregnancy discomfort, and improve overall healthy sleeping posture. The Original Wonder Disc promotes proper spinal alignment to help relieve pressure on joints. The self-centering design helps keep pillow in place without the need for straps. This pillow may also be used for resting or sleeping in a sitting position. Simply place the concave center of the pillow against your head and allow the outer edge of the pillow to gently cradle the head. This versatile support can be used as a knee or leg pillow, a leg elevation pillow, a support pillow for your pregnant belly, or a travel pillow while resting your head on an airplane. You spend approximately a third of your life sleeping; make it count by choosing the best comfort and support for your body! Made with a unique molded foam that is nontoxic, non-allergenic, and highly resilient, the Original Wonder Disc provides a firm foundation while remaining soft to the touch. Supportive and firm, this pillow provides optimal support for your knees, yet allows them to slightly sink into the foam. Unlike memory foam, this high quality, strong, resilient molded foam will maintain its shape for years of use and support. Each pillow comes with a machine washable, soft, fitted cover that is easily removed for washing. The soft, 100% cotton flannel cover allows air to circulate and helps wick away moisture from your skin.