LUCID 2 Inch Ventilated Memory Foam Mattress Topper - 3 Year Warranty - Split California King 2-inch premium memory foam mattress topper backed by a 3-year warranty Ventilated to increase air flow for a soothing sleep temperature LUCID memory foam formula offers superior comfort and pressure relief Open cell technology prevents lasting body impressions; CertiPUR-US certified Includes one half of a Split Cal King mattress topper measuring 36" x 84" so you can customize each half of the bed or use on an adjustable bed