Eco Ultimate Reversible 2 inch Gel & Memory Foam Mattress Topper Size: Twin Add extra comfort and cooling support to your mattress with this 2-in-1 memory foam topper 2-Sided Reversible Gel and Memory Foam Mattress Topper 2-inch Gel Infused Memory Foam Mattress Topper | Eco Ultimate Cool Gel Memory Foam Topper 1-inch layer of Gel Infused Memory Foam and 1-inch layer of cooling gel infused memory foam Foam only topper fits over your mattress and under your standard fitted sheet