Emma premium mattress consists of 5.5cm foam layer, with a 12.5cm pocket-spring core above, topped by additional layers of memory foam and a bit more foam. The deep springs in the mattress allow for even more breathability during warmer nights, helping you keep cool while you sleep.  On a scale of 1-10 with 1 being the firmest, we've classified this mattress as a 4.4, or medium firm. It's a no-flip mattress, but you’ll need to rotate it regularly, once a month for the first 6 months, then every 3 months after that. This bed-in-a-box foam mattress is delivered vacuum-packed, directly from our production facilities to your door.  It comes with a lengthy 200-night trial period and a 10-year guarantee. If you decide you don’t like it within the trial period, you can send it back free of charge for a full refund.