The Z Wedge uses gravity to provide relief for those who suffer from sinus pressure, heartburn and acid reflux. The Wedge gradually inclines your upper body by approximately 7 inches to stop stomach acids from travelling back up your esophagus. The polyurethane foam and design is supportive enough to make this a great tool to prop yourself up in bed to watch TV or read a book. Naturally hypoallergenic and dust mite resistant foam was created using open-cell technology for a more durable, longer-lasting foam. The super soft cover made from rayon from bamboo velour (75% polyester, 25% rayon from bamboo) allows for greater airflow and is easily removed for laundering. A 3-year warranty protects the pillow and cover against manufacturer's defect. Pillow measures 24