Orthotic knee braces provide excellent support and can significantly improve spinal alignment, help relieve back, hip, leg, knee, arthritis and sciatica, as well as improve blood circulation in both legs. Elastic band design : The leg pillow maintains the best sleeping position throughout the night and it will not suddenly fall or slip. Use the right method to relieve back, hip, knee and ankle pain. Simply place it between the thighs or under the knees to relieve your specific pain. It can be used as a knee retractor during pregnancy or after recovery. It is also convenient to use when traveling. This memory foam cotton knee pillow has a washable cover for easy cleaning. Advanced High: High Density Memory Foam: 100% memory foam high quality durable, comfortable for a long time, better than other pillows. It won't flatten out over time. Vented memory foam pillow : Unlike traditional memory foam pillows that are designed to absorb your body heat to compress it, vented air holes in memory foam promote airflow all night.