A polyurethane foam mattress overlay has several sections defined in a relatively flat support surface thereof. The sections are longitudinally disposed so as to correspond with different parts of a user's body. Each such section has predetermined support characteristics which are selected in relationship...http://www.google.fr/patents/US4862538?utm_source=gb-gplus-shareBrevet US4862538 - Multi-section mattress overlay for systematized pressure dispersion
Multi-section mattress overlay for systematized pressure dispersion
