Drift off on a cloud of comfort and support as the Aurora Harmony brings together a reliable 13.5g Bonnell spring core with soft, breathable comfort layers for a restful night's sleep. Enjoy a medium firmness that suits a range of sleeping styles, while the hypoallergenic quilted panel top crafted from 100% polyester keeps things fresh and irritation-free. Rolled and boxed for convenience, this king size bonnell spring mattress with comfort layers is designed for practicality and sustainability, making it a smart choice for everyday comfort and back support.