Upgraded Ergonomic Design: Unique L-shaped structure and ergonomic curves, fits lower back and seat contour, provides stable support for long-distance driving, reduces sitting pressure and discomfortUniversal Size: Measures 17.32″ × 16.54″, fits truck and various vehicle seats. Raises seat height, improves visibility, naturally supports the waistComfort Cushion: High-density slow-rebound memory foam inner layer, soft resilient support without sagging. Breathable cotton fabric surface, cool in summer, removable cover washable by hand or machineMulti-Scenario Use, Lightweight & Portable: Easy to carry, fits office chairs, dining chairs, sofas, truck seats, wheelchairs for all sitting needsNon-Slip & Secure, Airflow Stays Cool: Silicone anti-slip dots and adjustable strap for firm placement. Hollow center design enhances air circulation, keeps dry and comfortable for long drives