Experience the ultimate nightrsquos rest with the memorypedic visco 4000 mattress with cool flex it features a visco memory foam build which was built on nasa technology and moulds to your body for perfect support it is also silent as it has no strings and is ideal for allergy suffers as it is hypoallergenicthis mattress also has the cool flex fabric knitted into the cover cool flex is ideal for when the heat goes up in the summer and you want to stay cool as excess heat and moisture vanis