"Natural latex" refers to a type of rubber that is derived from the sap of the rubber tree. It is not synthetic or artificially made but comes directly from nature. Full definition
We also make the only natural memory foam mattresses in the world so you get the natural qualities of natural latex mattresses but with the comfort of memory foam mattresses. (myessentia.com)
Thanks to natural latex foam and soft bamboo cover this mattress is extremely comfortable and supportive. (thankyourbaby.com)