The Flexicell Evolution from Breasley is a british made vacuum packed mattress available to you in no more than 3-5 working days. Containing three layers of foam designed to provide a luxurious feel and lots of comfortable support the Evolution really is a superb technologically advanced mattress designed to last. The initial layer is 11cm of castellated foam flex to attribute a good air flow through the mattress to ensure a cool sleep (this is 2 x 8cm layers on the 25cm). Then nestled just above this is a 7cm layer of slow recovery memory foam to provide that stress free support. Finally the comfort layer a soft moulding 2cm layer of memory foam. The middle section of the evolution is carefully zoned to provide better support on the areas which are most affected by pressure.Visco elastic is a clever innovative substance developed originally by NASA to relieve pressure during flight and this can is applied in the same way to the way we sleep taking the pressure from body by sinking gradually with the body creating maximum support and removing the movement creating a restful night.