Define your goal first for the sleep pillow elevated leg, such as post-recovery knee elevation, back or hip relief, or general nightly comfort. Then decide between a knee wedge pillow, like an 8 inch Todyjeyho wedge designed for leg elevation, or a memory foam knee pillow from a generic brand for contouring support. Consider the shape, height, and how easy it is to clean (look for a removable cover). Also check the product category and brand relevance to your needs, such as choosing from lumbar-pillows or leg-positioner-pillows options.