Experience restorative sleep with a firm bonnell spring super king mattress for back support that blends robust orthopaedic support with breathable comfort for your nightly rest. Aurora's 12.5g Open Coil Bonnell spring system delivers consistent firmness to help promote better posture and ease pressure on joints and muscles, making it ideal if you're seeking relief from joint pain or need reliable support. The quilted panel top in soft polyester fabric ensures a cushioned yet durable surface, while recycled polyester layers add breathability and eco-conscious comfort. With a medium to firm feel, this super king mattress with posture tech firm comfort layers suits back and stomach sleepers, and arrives rolled and boxed for effortless setup in any home.