Outlast is the most advanced technology fabric available for mattress production. Outlast was developed for use in space suits in order to prevent astronauts from becoming either too cold or too warm. The fabric absorbs your body heat when you get warm & releases it back as you cool down, thus stabilising your temperature & allowing an undisturbed sleep. A mesh panel running round the border of the mattress allows constant airflow & is a further aid in regulating sleeping temperature. This Flexcell Pocket mattress has 2000 individually pocketed springs. It has a very responsive feel, so as you lie on the mattress & change your sleeping position the springs will adapt instantly to your body shape. The springs have been encapsulated by Reflex foam which makes sure that the support runs right to the edge of the mattress so that you can use the whole sleeping surface. There is a deep layer of pressure relieving memory foam on top of the mattress & this has been zoned. There is a slightly softer zone of foam in the centre section so that the mattress accepts your body shape properly to give the perfect sleeping posture. Free next day delivery. Mattress is 24cm deep 2000 individually pocketed springs Encapsulated springs for full edge support 70mm of slow recovery memory foam Softer mid zone for perfect sleeping posture 5 year guarantee Vacuum packed for ease of delivery Next day delivery