1. Unique design: The ergonomic contour design allows your legs, hips and spine to maintain ideal alignment and improve blood circulation during sleep. 2. Advanced high-density memory foam: Made of 100% high-quality durable cut memory foam, and it can maintain comfort for a long time. It is better than other pillows, and it will not become flat over time. 3. Use the right method to relieve pain in the back, hips, knees and ankles. Just put between the thighs or below the knees to help with your specific pain. 4. Ventilation holes are provided in the memory foam to promote air circulation throughout the night. Temperature-adjusting foam technology pushes heat away from the body to prevent you from feeling overheated. 5. It can be used as a knee spacer during pregnancy or after recovery. It is also convenient to use during travel. This memory cotton knee pillow has a washable cover for easy cleaning.