Firm Medical Grade Foam Half Moon Multiuse Knee, Leg and Back Support Bolster Pillow for Neck Pain Relief, Sciatica | L -20.5"X W - 8"X H - 4.5'' InchesThe Metron Half Moon Pillow This foam pillow adjusts and conforms to the shape of your body providing firm support while promoting restful, all night, uninterrupted sleep. It is a great all in one neck pillow, lumbar roll. Perfect for sitting upright, laying down, reading, watching TV, napping or all night sleeps. Place the half moon foam pillow under your knees to lower back strain and leg pain or place between your knees for correct sleeping posture