【Ergonomic U-shaped Design Cares for Hips and Coccyx】This chair cushion features a W-shaped design at the front that wraps around both sides of the buttocks, effectively distributing pressure on the ischial bones. The U-shaped cut at the rear avoids contact with the coccyx, eliminating the "pressure on the tailbone" that traditional cushions and seat cushions couldn't improve. 【Designed to Naturally Guide You to the Correct Posture】The slight forward tilt naturally straightens the pelvis and extends the spine just by sitting. It maintains the correct posture without strain. It reduces the burden on the lower back even during long hours of desk work, providing a comfortable sitting experience that prevents buttock pain. 【High-Density Memory Foam Supports Long-Lasting Comfort】It uses a low-rebound cushion (low-rebound seat cushion) material that disperses body pressure. As a chair cushion, it fits softly while providing firm support, making it ideal for use as a seat cushion for chairs, with durability that prevents deformation even after sitting for long periods. *Recommended for those weighing 90kg or less. 【Highly Breathable Mesh Material and Non-Slip Processing】The surface is made of highly breathable mesh fabric, so it is comfortable and less prone to stuffiness even when sitting for long periods. The cover is washable and can be kept clean. The bottom is non-slip, making it less likely to slip on chairs and car seats, and providing stable use as a seat cushion. 【Convenient Size for Use in Various Scenes】Size: (approx.) Length 40.5 x Width 48.5 x Thickness 5-11cm (U-shaped type). Fits various chairs such as office chairs, gaming chairs, car seats, and wheelchairs. Can be used as an office cushion, driving cushion, living room cushion, and outdoor cushion. It meets the needs of everyone who sits for long periods. Thank you for viewing.