Our knee pillow fits comfortably between your knees and provides maximum comfort and support to relieve sciatica pain, back pain, and pressure on the lower back. Premium Memory Foam: certified foam to ensure safety and quality. This is a high-grade, great-quality knee pillow. The knee pillow is soft and supportive, giving you a welcoming feel that stays comfortable in any position while providing liquid-like quality that contours to your body, aligns your spine, and improves circulation. Breathable Machine Washable Cover: The longer silkier fibers of the breathable zippered cover increases airflow so you’re always sleeping cool and is machine washable for easy cleaning.