Sleep cool and comfortably thanks to the Allswell 4-inch Memory Foam Mattress Topper Infused with Cooling Diamond Gel. A four-inch layer of open-cell foam provides plush comfort and support while the real diamond particles keep your sleep surface cool. It is engineered to be two-sided and features a wave convolution to enhance your supportive sleep experience. Just like our mattresses themselves they are a cushy testament to our passion for great sleep ? blending state-of-the-art materials and smart technology but at a price that?s downright retro. These toppers are designed to take your mattress a level up and make your Allswell dreams even sweeter. Enjoy a good night?s rest with the Allswell 4-inch Memory Foam Mattress Topper Infused with Cooling Diamond Gel.