Spa Sensations 8" Memory Foam Mattress, Size: King (King) 8" thick memory foam mattress responds to the heat and pressure of your body; Creates a customized sleep surface High-density foam base layer adds support King: 76'' x 80'' | Cal King: 72" x 84" Memory foam mattress is tightly packed and vacuum sealed, please allow several hours to return to original shape. There may be a faint odor from being sealed, this is normal and will disappear in a few hours when exposed to air.