hip collapse caused by sitting for a long time.If for some reason our cushions do not fit your seat, just contact us and we will address your issue within 24 hours. Features: Designed for Comfort - The unique tail support increases height by 5.8IN, relieving pressure on the tail, enhancing coccyx support; raising both sides by 5.8IN to support the buttocks for a relaxed shaping, avoiding hip sagging caused by long periods of sitting; The W-shaped design ensures natural relaxation of the legs without numbness or discomfort, hip collapse caused by sitting for a long time.If for some reason our cushions do not fit your seat, just contact us and we will address your issue within 24 hours. High-Quality Memory Foam - Our office chair cushions are made of 100% pure memory foam, which is soft yet firm, providing slow rebound "zero pressure" support. They have undergone professional safety testing, ensuring flexibility and no deformation after repeated use. Versatile Health Cushion - Our seat cushion is ergonomically designed to fully envelop the adult seat cushions, providing long-lasting comfort even during extended periods of sitting. With three major zones for sitting, including leg, hip, and coccyx support, it effectively relieves sciatica, coccyx pain, leg pain, and lower back pain. Multiple Uses - This office chair cushion fits most types of chairs, Suitable for most office chairs, car seats, home chairs, gaming chairs, wheelchairs, our pressure relief seat cushion is generously sized (20x16x5.8IN) and thick enough to support adults weighing between 100-220 pounds. Convenience - Covered in non-slip silicone particles on the bottom, our office chair cushion stays firmly in place for added stability. The breathable cover is washable for easy maintenance, setting a new standard for health and hygiene. Practical Gift - Suitable for people of all ages, it can be used in dormitories, offices, computers desk, bedrooms, etc. A amazing birthday or holiday present for family, friends, workmates, grandparent and teenagers. Package Includes: 1 x Office chair cushion Listing and template services provided by inkFrog