Pocket spring mattresses offer greater lumbar support than the more basic open coil units (see below) as they have considerably more springs – usually from 1,000 to 3,500 plus (based on a king size mattress). The springs are individually housed in fabric pockets and move independently from one another – this means the springs only compress where a person lies, allowing for motion separation between both sides of the bed. Pocket spring mattresses are perfectly suited for couples when there’s a considerable weight or size difference between them – i.e. when one partner turns over on such a mattress the other will detect little or no movement.
As a general rule, the higher the number of springs the better the mattress. However, the type and quantity of the fillings will also contribute to the overall quality of the mattress. Another thing to look out for is hand side-stitching, which improves the edge-to-edge support and life expectancy of a mattress, and is usually found in higher quality products.