However, it cannot be assumed that the more you pay the more comfortable the mattress will be: the design of the mattress matters, but you also pay for the name, just as you do for designer clothes. When you purchase a bed keep in mind that, with respect to comfort, the mattress matters more than the base.
Bamboo is a sustainable fiber, and does not depend on oil as most synthetic fibers do. Mattresses that use natural bamboo fiber covers include Englander and Symbol, but there may be more. Simply check out the cover material as opposed to the materials used in the interior layers of the mattress that wrap the spring unit.