Our Dual layer mattress topper is one of our most innovative mattress toppers with two layers sewn together with a breathable layer in the middle to increase circulation during the night. This topper is one of our softer toppers and are a great option for a firm mattress to make it softer or to go over a old mattress to give it a new upper layer, four corner straps to hold it in place and machine washable for easy care in the comfort of your own home. - Snug City Dual Layer Mattress Topper Air Flow Hypo Allergenic Soft Touch Bedding in White - Size: King