Details 3-Layer Hybrid Memory foam construction for support, breathability, and bounce.. Open-cell hypoallergenic Latex designed to keep you cool all night. Combination of softer foam and firm, supportive foam for every curve and every body. Please note: Any new product will expand within minuites and can have a mild scent upon unboxing that will dissipate in a few hours in a well-ventilated room.. 100 night trial and free returns within 100 days of receipt of shipment on products sold by Casper.