The Visco Therapy Memory Mattress is made from unique upper layer of high density visco-elastic polymer gel. Originally designed for NASA missions, it is soft and pliable following the outline of your body perfectly. So comfortable, the mattress provides the best possible support to your spine allowing your body to immediately find the best sleeping position, reducing tossing and turning. Developed by NASA, memory foam is a unique layer of high density visco-elastic polymer gel which is heat and pressure sensitive. Recommended by chiropractors and doctors alike, it gives an elastic ability which allows it to conform to your body shape to relieve pressure points across the body. This improves blood circulation and improves your sleep. A thick layer of reflex foam is used to act as the support mechanism/foundation layer in this mattress. Unlike memory foam, reflex foam does not mould to your body and bounces back very quickly. Due to these special properties, it is a fairly firm material which will provide a supportive layer to a mattress to ensure your weight is distributed properly. To provide extra softness and plumpness to the mattress, polyester wadding is added into our covers where the end results provide a soft and luxury feeling mattress. Sanitised materials are used to provide hypoallergenic and anti-dust mite properties that makes it a great for allergy and asthma suffers. An orthopaedic quality that provides support to all parts of your body to ensure you are sleeping correctly and have a restless free nights sleep. This mattress is available either Regular comfort or Firmer option. This mattress has an easy zip off cover that not only has anti-dust mite properties but can be dry cleaned with ease. Specification 5cm Visco foam 20cm thickness Dry cleanable zip off cover Available in regular and firm comfort Orthopedic mattress Sanitised fabric Hypoallergenic Anti dustmite 5 Year warranty Made to British Standards/regulations Mattress Sizes 3ft (W90 x L190 cm) 4ft (W120 X 190cm) 4ft 6 (W135 x L190cm) 5ft (W150 x L200cm) 6ft (W180 X 200cm) This mattress is rolled and vacuum-packed, so please allow up to 12-24 hours to expand to its natural depth before use.