Top quality memory foam mattress,  king size. Equivalent of Tempur mattress quality 

https://www.ergoflex.co.uk/guide-to-memory-foam

Great condition.  It's approaching 15 years old but only sign of age is the removable washable cover that is threadbare in places , as shown in picture. 

Collect from NE34 6. between the Nook and Harton Village