Sleep Creations 6" Memory Foam Mattress with Aerus NaturalTM Memory Foam Comfort Layer - Queen 1.5" Convoluted 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 the 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 250 Thread Count Cotton Cover zippered for easy removal