The Sealy Posturepedic Plus Barrett Court III Plush Mattress in Cal King, King, Queen, Full XL, Full, Twin XL, and Twin mattress sizes. Built on a 60 year legacy of support, the new Sealy Posturepedic is the only mattress supportive enough for whatever you do in bed. Sealy Posturepedic mattresses feature titanium springs which are both lighter and stronger than steel. The Posturepedic mattress also features a reinforced CoreSupport Center, which provides additional support where you need it most. The StableSupport Foundation provides rubberized foundation cover to hold sheets in place and stop the mattress from shifting. Each mattress gives unprecedented back support an comfort where you need it most.