Silentnight Paige 1400 Pocket Ortho Mattress - Extra Firm in Double, King and Super King Sizes This mattress boasts Silentnight’s superior Mirapocket® spring system, which includes a single layer of 1400 individual pocket springs. These springs react independently to your movement throughout the night, resulting in pressure relief and zoned support that are scientifically proven to improve posture. Finished with a hand-tufted sleep surface for an extra firm, orthopedic feel, it’s idea for people who sleep on their backs or require added back support. It’s features a comfort layer to ensure enhanced breathability and to naturally evaporate moisture for a clean and fresh sleeping environment. Comes with our Silentnight 5 Year Guarantee, for your peace of mind. Assembly: Ready Assembled Depth: 200 CM Height: 24.5 CM Width: 150 CM Firmness: Extra Firm Mirapocket® superior spring system for zoned support 1400 zoned pocket springs for ultimate pressure relief Extra Firm comfort rating, ideal for those that sleep on their back or need spinal support Eco Comfort Fibre™ comfort layers ensure enhanced breathability for a fresher sleep Single Sided, simply rotate head to toe Handmade in the UK