The silentnight sofia mirapocket 1200 mattress is a double sided mattress with a soft knit cover and 1200 individually pocketed springs the advanced zoned mirapocket spring system offers the ultimate in comfort each mattress with mirapocket technology contains individual springs that are held under tension in their own fabric pockets each spring responds to your body spreading your weight evenly across the bed providing zoned support where you need it most and luxurious tailored comfort tha