Aveline 6" Mattress: Mattress with polyurethane foam Features an open cell memory foam solution Topped with a gel-infused surface Dissipates the body heat while quickly conforming to your weight and position Relieves pressure points, reduces bounce between two sleepers Takes two to four hours to expand most of the way, and a day to expand fully Includes one full mattress and a removable stretch knit diamond patterned cover Slatted bases should be less than 3" apart Box spring or foundation are optional CertiPUR-US certified Measurements: Twin measures 75" W x 39" D x 6" H Full measures 75" W x 54" D x 6" H Queen measures 80" W x 60" D x 6" H King measures 80" W x 76" D x 6" H " material="Polyurethane foam" origin="China"