The 4 Swirl Gel Memory Foam Mattress Topper by Zinus will enhance the comfort your mattress with cooling, supportive foam. A cover is not included as our topper can fit under any standard fitted or deep-pocket fitted sheet. The latest evolution of memory foam, Biofoam, replaces some of the traditional petroleum with natural plant oil, and includes natural green tea extract and all- natural active charcoal to help absorb moisture, eliminate odors, and keep your mattress topper fresh. Please open your mattress topper package within 72 hours of receipt and allow 48 hours for your new mattress topper to return to its original, plush shape. Color: Blue/ Beige.