Open Coil
Open coil mattresses sometimes also known as Bonnell sprung mattresses. Offers a traditional method for manufacturing with large production at a lower cost, making them a very cheap mattress to buy. On average an open coil mattress will have around 300 springs, they come with various fillings including; wool, white fibre, cotton, silk and sometimes cashmere. Bonnell sprung mattresses tend to come in a soft, medium, medium-firm and orthopaedic mattress.
