"SOFT ALTERNATIVE DOWN - The 3 inches of ultra-soft microfiber filling offers the traditional, reliable comfort of down, but without any odours or the stiff parts that normally come with the down: The 3"" height makes it even softer and more comfortable than ordinary 2"" toppers. MACHINE WASHABLE: The percale cover made of 100% cotton is soft and breathable. The 250 thread count wraps the mattress topper in comfortable, long-lasting protection. Machine washable and dryable so the fresh feeling never runs out. LONG LASTING ""BAFFLE BOX"" DESIGN: The stitching helps maintain shape and improves breathability by supporting the distribution of the filling in uniform compartments that prevent it from shifting or accumulating in certain areas. SECURE TAPES - There is a reinforced SecureStrap elastic tape in each corner to securely place the topper to prevent it from shifting at night, providing even comfort. HIGHER COMFORT: You can fluff it by hand periodically or place it in the dryer on low heat to increase the amount of air trapped in the filling, improving shape and comfort."