【Ergonomic and Comfortable Sitting】 This U-shaped memory foam seat cushion adopts an innovative 3D design that perfectly fits the curves of the human body, maintaining a comfortable posture even after sitting for long periods. The unique U-shaped opening accurately avoids the pressure zone around the coccyx, and when combined with the memory foam, it evenly distributes weight, effectively reducing fatigue from prolonged sitting. The flexible material provides moderate support, offering cloud-like comfort in the office, while driving, or at home. 【Promotes Natural and Healthy Posture】 When you sit, it gently guides your center of gravity forward, like an invisible assistant, correcting your spinal posture. Without conscious adjustment, you can naturally maintain a healthy sitting posture with your eyes, ears, shoulders, and hips aligned. Say goodbye to the stiffness and discomfort of traditional cushions, even after sitting for extended periods. The high-density memory foam conforms to the ergonomic curves, providing lasting support. Even after 8 hours of continuous use, your spine remains in a relaxed and comfortable state, completely alleviating the pressure from prolonged sitting. 【Excellent Breathability & Easy Care】 The outer mesh fabric is highly breathable, promoting air circulation and eliminating the problems of poor ventilation and excessive sweating often associated with traditional seat cushions, making it suitable for all seasons. The outer cover is zippered and easily removable for washing, and can be machine-washed. You can always maintain a clean and comfortable state. Note: The outer cover can be machine-washed, but the cushion itself cannot be washed. *After opening, please place the lumbar support cushion in a well-ventilated place for 24-48 hours. This will reduce any odors that may have occurred during packaging and allow the cushion's shape and elasticity to fully recover. We also welcome combined purchases with other products. We will offer a discount. Please note that combined shipping may be difficult depending on the product due to shipping costs. Thank you for your understanding.