Bonnell Spring Mattress Bonnell Spring Mattress is produced with imported springs materials. Bonnell springs are being tided up with Helica Wire which provides solid spring structure. Spring mattress is specially made for those who want a firm surface to sleep on. These bonnel spring mattress is internationally accepted most comfortable & luxurious mattress in mattress sector. Key Features Premium quality fabrics. Being comfortable. Immediate relaxation. Optimum softness. Unique body support. Best quality spring and built with advanced machinery. Quilted top layer with super soft foam. Higher quality quilted fabrics with soft fiber padding & foam. Best cotton felt for firmness. Thickness of Spring Mattress 6 or 8 fixed