Luxury Budget Open Coil Sprung 7 Inch Deep Blue Check Mattress "This budget mattress has been designed and constructed with a European engineered Bonnell open coil spring unit, allowing the weight to be distributed evenly across the mattress for extra comfort and support. These mattresses are ideal for bunk beds, cabin beds, triple sleepers etc but are suitable for all base types. This is a quality children's mattress containing 5 layers of comfort fillings over a 13. 5 gauge open coil spring unit and covered in a