The Zinus gel memory foam 3 inch mattress topper will enhance the comfort your mattress with cooling and comfortable memory foam support. A cover is not included as our memory foam topper can fit under any standard fitted or deep-pocket fitted sheet. Gel Memory Foam Topper, Cal. King Size 2 Inch Thick, Ultra-Premium Gel-Infused Memory Foam Mattress/Bed Topper/Pad for Better Sleep and Conforming Comfort. .