Miracoil springs
Silentnight have researched and developed their own way to create a supportive mattress. It’s called the miracoil system, which is essentially lots of interwoven springs that run vertically along a mattress. Normally, open coil spring systems are similar but run horizontally along the bed. This decreases the chance of ‘roll-together’ and gives the mattress a firm feel, hence why it has been rated firmer on the firmness scale.