Our Medium Headleveler/Ortho-Cerv pillow offers moderate, comfortable support to back and side sleepers. Did you know that the softer your mattress, the thinner your pillows should be? Alignment is important while you’re snoozing, so you want to be sure to pick the right pillow to match your support needs. The thickness of our Standard Medium cervical pillow, for example, would be well-suited to someone who sleeps on an average to firm mattress.