When choosing a king size mattress in the UK, the focus shouldn’t be on how soft it feels in the first minute, but how it supports your spine in the eighth hour. A multi-layer DHS foundation balances the “give” of memory foam with the “push-back” of Bonnell springs. This synergy prevents that heavy, morning stiffness by ensuring your pressure points—hips, shoulders, and lower back—are cushioned rather than crushed.