Sciatica, Back & Hip Pain Relief at Night - Ergonomically designed knee pillow fits comfortably between your knees and provides maximum support and comfort at night that helps relieve sciatica pain and pressure on the lower back. LASA knee pillow is designed to help relieve back pain at night however it may not work for all conditions or completely eliminate all symptoms or pain. It may take a few days for your body to get adjusted to using a knee pillow at night and see results Premium High-Density Memory Foam - Made with 100% premium quality durable cut memory foam to provide long-lasting comfort for hours, superior to other pillows it won't go flat over time Ergonomic Design - Ergonomically contoured design keeps your legs, hip and spine in ideal alignment while sleeping and improves circulation. Product Dimensions: 29 x 18.5 x 20.5cm Breathable Easy Clean Cover - Breathable zippered cover ensures the pillow does not get warm and is machine washable for easy cleaning