Guides the pelvis to the optimal angle, reducing strain on the lower back and back. The "lever principle" causes the front to sink and the back to rise when seated. Reduces stress on the lower back. "Cradle structure" that does not fix the pelvis. US and Japan patent pending. Patent number 5502901. Easy to clean. Washable. Material with high grip that prevents the buttocks from slipping. Lightweight and easy to carry. Great for travel and on the go. Material that suppresses the growth of bacteria. Please be careful when using BackJoy in a car seat. *The "Posture" material may become hot and deform if stored in a car for a long time in the summer. We recommend the "Relief" material BackJoy. - Brand: BackJoy - Color: Black - Features: Breathable design - Usage: Posture correction - Size: Standard size - Model name: BackJoy Posture Plus