The Tranquility 1000 Pocket mattress by Silentnight features mattresses for a breathable and refreshing sleep. The comfort filling is highly breathable so you can enjoy a rejuvenating and refreshing night's sleep. Comfort Fibre brings incredible comfort. Featuring Silentnight's Mirapocket support system which offers even weight distribution to assist easy movement and improve spinal alignment for an undisturbed night's sleep. This support system features individual responsive pocket springs which conform and adjust to your body weight resulting in luxurious comfort and tailored support. The zoned support system has been scientifically proven to improve your spinal alignment and posture. Whether you're a front, back or side sleeper, Silentnight's Mirapocket support system has a firmness rating to suit your sleeping position. This mattress has a medium comfort rating, not too soft, not too firm. Topped with a quilted finish, perfect for sleepers who prefer a smoother sleep surface. This mattress is single sided, so make sure you rotate from head to toe regularly to get the most out of your mattress.