<p>The InteVision Four Position, Half-Moon Bolster Pillow is designed with your utmost comfort in mind. For extra comfort, we have upgraded the pillow cover to a silky-smooth, 400 thread count, 100% Egyptian cotton cover that is removable and machine-washable. It is made of a memory foam layer on top of a highly resilient base foam so that it feels soft and comfortable while providing the best support for your legs and knees to ensure you get a good night's sleep. It helps reduce back pain, supporting your legs and knees in an elevated position, improving circulation. It is great for side or back sleepers. </p><p>For people who need to sleep on a wedge pillow to help reduce symptoms of acid reflux, COPD, back pain, and post surgery, you can place this pillow under your knees to help you stay on the most comfortable position on the wedge pillow without sliding down.</p><p>If you are not completely satisfied with the product, you can return it in 30 days for a full refund.</p>