Zinus Memory Foam 8 Inch Green Tea Mattress,&nbsp;Queen Conforming Green Tea Memory Foam comfort and pressure relieving support for a better night's sleep Mattress layers include: 2 inches Memory Foam, 2 inches Pressure Relieving Comfort Foam, 4 inches Airflow High-density Base Support Foam. Fabric- Knitted jacquard. Comfort level-Firm. Core construction-Memory foam Foam is CertiPUR - US Certified for durability, performance, and content. It aids the memory foam to conform to your body so your bones and joints sink into softness instead of feel their own weight against a surface Infused with Green Tea extract and Castor Natural Seed Oil to naturally retard odor & bacteria Smartly Shipped - Our patented technology allows our mattresses to be efficiently compressed, rolled and shipped in a box conveniently to your door NOTE: Though our mattresses typically expand in 48 to 72 hours, they may take up to a week in some cases. Other factors, like cold weather, can also affect decompression times.