Made from a high density visco elastic polymer gel this memory mattress moulds to the contours of your body. This mattress is heat sensitive and as a result you won't ever feel too hot or too cool.Originally developed for space missions by NASA the visco elastic helps relieve pressure and provides exceptional support helping the blood to flow and circulate freely. With an 10cm layer of the substance it will guarentee a fabulous physical support. The Visco 4000 Platinum has the highest depth of Visco Elastic polymer gel, making it more suitable for the heavier sleeper. This will ensure a great nights sleep.The mattress is hypoallergenic and helps prevents bedsores whilst providing a resistance against dustmites.**4000 only available in Velour Fabric, VCOOL Fabric is not available for this product**