The Edblo 4 Crown is a no-turn mattress with a quilted mattress surface which creates a smooth and even sleeping surface. The added ComfyFill Supporter Top is an additional layer of foam and fillings to the mattress which provides you with a firm supportive comfort feel. The bonnell spring unit provides the mattress with a strong and durable support structure. The Edblo Crown mattress is also equipped with what is called an insulator. This is a quality fibre pad which eliminates spring feel from the mattress and isolates the mattress comfort layers from the spring unit, this results in a long lasting and constant comfort of the mattress. The 4 Crown bed from Edblo is a great value for money option for the more economical buyer.