The Blueflex Gel Memory Foam Mattress Topper may be the most advanced mattress topper that you'll ever see. Unlike many other mattress toppers, which are simply overstuffed comforters, the Blueflex Gel Memory Foam Mattress Topper is filled with today's best memory foam. This material is well suited to provide a sleeping surface that is soft, without being so soft that it cannot provide the support your body needs during sleep.