Copper Fresh Envy 4000 King Size Mattress

Knitted cover
A soft knitted finish that's breathable, which means air can move through the sleep surface rather than building up heat against your skin.

35mm Memory foam
This layer contours and cushions for pressure relief, so your hips and shoulders sink in slightly rather than pressing against a hard surface. The brand says it's backed by 12 years of R and D using AI and body pressure mapping.

Pure copper layer
An entire layer of pure copper, which the brand states is 1000 times more conductive than wool, silk or polyester. In practice, that means heat is drawn away from your body, and copper is naturally antimicrobial too.

Reflex foam
Sitting between the copper and the springs, this firmer foam helps achieve the medium feel. It stops you sinking too far into the comfort layers above.

1000 pocket spring unit
Each spring sits in its own fabric pocket and works independently, which means movement on one side of the bed is far less likely to travel across to yours.

Recycled rebound foam base
A durable base with foam-encapsulated edge support, so the mattress holds its shape and you can sit or sleep near the edge without it giving way.

Layer details from mattressonline.co.uk product page, September 2026.