Sleep Creations 12-Inch Ultra-Luxe Memory Foam Mattress with Aerus Natural Memory Foam Comfort Layer, King 3" Aerus NaturalTM Premium 4.0 pound density Memory Foam Comfort Layer Unique open-cell, highly-breathable memory foam provides ultra comfort as well as heat dissipation and enhanced airflow which contribute to a cooler sleeping surface. This is a product where the foam in this mattress is produced using Natural plant-based ingredients in place of the traditional petroleum based ingredients normally used by other manufacturers. This mattress is made using a patented VPFSM process which ensures that virtually zero emissons are released to the environment during its manufacture. This is another way in which this mattress provides a 'Green" benefit Includes a soft, cashmere-like Rayon made from bamboo fiber cover which is made from sustainable plant material and also helps to wick moisture away from the body's surface for a cooler night's sleep