The Horizon Discovery 1500 Pocket Memory Mattress is a remarkably comfortable mattress and the double size was awarded a Which? Best Buy endorsement in October 2020. Featuring 1500 pocket springs and a deep layer of memory foam, you’ll get total comfort, soothing pressure relief and great support as you sleep. In fact, the super-deep, extra-breathable memory foam layer is a rare find in the mattress world – and it ensures the luxury comfort you deserve. With a 10 Year Guarantee and Free Next Day Delivery, you can experience a better night’s sleep as soon as tomorrow.