The silentnight 7 zone mattress is designed with 7 rows of layered foam each row offers soft to medium support for the neck shoulders and joints with firmer support for your back a 3cm layer of miratex foam will mould around your body contours to prevent roll off when sleeping close to the edge it will also prevent roll together by absorbing movement between you and your partner this mattress has been treated with purotex to reduce moisture and dust mite allergens creating a drier f