There are primarily three main parts inside a mattress. These are the support core, comfort layer and the cover ...

The brand’s most luxurious and natural mattress yet, the Simba Hybrid Ultra is made up of an astonishing 13 layers of foam, springs and comfort for its most cooling and comfortable night’s ...

Inside the mattress is a pocket spring core ... are 1,000 full-sized pocketed springs and 1,500 mini springs, positioned between comfort layers. My body felt light, relaxed and well supported.

There are also mattresses with between 15 and 20,000 springs in them. These are 'mini springs' and used in layers for extra comfort. With technological advances in springs and fillings ...

Layer 6: Back into familiar territory with our first layer of pocket springs. Excellent; we like a mattress with some bounce. Layer 7: Back to that 'airstream memory wool'. I'm still none the wiser.