Ideal for main bedrooms, guest rooms, rental properties, student accommodation and anyone replacing a tired mattress. Our best-selling mattress, and it is easy to see why. 20cm is where memory foam does its best work - deep enough to cushion your shoulders and hips properly, firm enough underneath that you never feel like you are sinking or fighting to turn over. If you are unsure which depth to choose, choose this one. Visco-elastic memory foam responds to body heat and moulds to your shape, spreading your weight so the places that usually wake you - shoulder, hip, lower back - stop being pressure points. It supports the spine and neck through the night, while a denser layer beneath keeps you level instead of letting you bow into the mattress. Because the foam absorbs movement rather than passing it across the bed, you are far less likely to be woken when your partner turns over. Its open-cell structure lets air circulate freely rather than trapping heat, and the foam is dust mite and mildew resistant - worth knowing if you suffer with asthma or allergies. The foam is CertiPUR certified, meaning it is independently tested and free from heavy metals and dyes. Both the materials and the mattress itself are made here in Britain, in a state-of-the-art facility in the heart of Yorkshire, and the whole mattress is tested to UK fire safety regulations. The soft knit cover unzips completely and machine washes, so the mattress stays fresh for years rather than months - and a bed can be properly freshened between tenants or guests. Available in all standard UK sizes, from Small Single to Super King. Your mattress is delivered rolled and boxed, which makes it far easier to carry up stairs and through narrow doorways than a conventional mattress. Please open it within 72 hours of delivery. Take it out of the box and unwrap it fully so it can unroll - do not use anything sharp to cut it open. Once unrolled, allow 48 to 72 hours in a well-heated, well-ventilated room for it to expand to full size and for the natural foam odour to clear. Any questions, our UK-based customer care team is here to help. DS Living Size: Small Double (4')