Ergonomic Design: Crafted with ergonomic principles, this seat cushion perfectly conforms to the natural curve of your spine, delivering firm lumbar and hip support while contouring to your hip shape. It effectively eases sciatica, pelvic, and coccyx pain, provides targeted support, and reduces leg fatigue and numbness Premium Memory Foam: The interior of this seat cushion is lined with breathable slow-rebound memory foam, which efficiently distributes pressure across your hips. Soft and comfortable to the touch, it maintains long-lasting coziness and resists collapsing even after hours of continuous sitting Expanded Vision: Featuring an 10.4-inch high lumbar support, a 18.7-inch wide base, and a 1.5-inch thick base, our trucker seat cushion elevates seat height. This enhancement improves lumbar support, optimizes driving visibility, and boosts both comfort and safety during use Breathable All-Season Fabric: Boasting a removable, machine-washable cover, the seat cushion offers year-round odor and moisture resistance for hassle-free cleaning. Its center cutout design enhances air circulation, while a non-slip rubber base and universal straps keep the cushion securely in place Universal Seat Cushion: It suits more than just car seats it s also compatible with office chairs, wheelchairs, gaming chairs, and other common seating types.