Transform Your Sleep - The American Made Serene 4" High Density topper is made from a 2.5 inch of temperature neutral gel memory foam and1.5 inch of plush down cover to provide comfort and support. Relieve Pain & Soreness - Utilizing thousands of testing hours and reviews the toppers designed to balance of softness and support. Alleviate back, hip or general soreness associated with a firm or old mattress. Focus on Quality & Durability - Changes to our innovative foam formula have enhanced its strength and stability. Extensive testing from labs such as SGS, ITS, TüV, ensures compliance to deliver superior feel and quality.