LUCID 2" Gel Infused Ventilated Memory Foam Mattress Topper, California King 2" topper's gel infusion helps provide temperature regulation for a cooler sleep experience than regular memory foam Ventilated to increase air flow and regulate sleeping temperature Open-cell technology prevents lasting body impressions CertiPur-US certified 3 lb plush memory foam California King size topper measures 72 x 84 inches; 3-Year U.S. warranty