Your body will thank you for choosing a Royal-Pedic 7-Zone natural latex mattress, which combines shoulder and hip flexibility with correct support for the lower back. This natural latex mattress is one of Royal-Pedics firmer latex versions. The Royal Latex Mattress is constructed similar to the Royal-Pedic All Cotton Mattresses in that it contains cotton padding and is hand tufted, but has a suppler feel, because this mattress contains a latex core rather than an inner-spring unit. The mattress features our 7-Zone natural latex core designed based upon sleep studies at the Kirschgartenclinic in Basel, Switzerland by Swiss researcher and sleep specialist Dr. Dietrich Schneider-Helmert. The 7-Zone design was found to provide optimal sleeping comfort and ergonomic support to all parts of the body. Skilled craftsmen hand layer the staple cotton padding on each side of the 7-Zone latex core to provide additional padding and support. These inner materials are then encased in Royal-Pedics Belgian100% cotton ticking, which provides ventilation of body heat, and finally hand tufted with European tufting straps to further pre-compress the cotton padding and provide firm, yet supple support. Royal-Pedic Box Spring construction is the finest available. Royal-Pedic provides 22% more coils than is standard for extra support and durability, and has 50% more coils located in the center-third of the box spring to support the body where its needed most. Mattress thickness is 7 1/2". Mattress Dimensions: Twin, 38 in x 75 in; Twin XL, 38 in x 80 in; Full, 53 in x 75 in; Queen, 60 in x 80 in; King, 76 in x 80 in; California King, 72 in x 84 in. Warranty: Manufacturer warranties item against defects in both material and workmanship. 10 years for mattresses/boxsprings.