LUCID 2.5 Inch Gel Infused Ventilated Memory Foam Mattress Topper with Removable Tencel Blend Cover 3-Year U.S. Warranty - Cal King Size 2.5" thick gel-infused memory foam captures and distributes heat Ventilated to increase air flow and regulate sleeping temperature Super-soft, removable Tencel blend cover Open-cell technology prevents lasting body impressions California King size measures 71 inches by 83 inches and comes with a 3 year U.S. warranty