The Signature Sleep Tranquil 2-Sided Pocket Spring Mattress has everything you need to spend a restful night of sleep, every night. Designed with a dual sided construction, the Tranquil has identical layers on either side of the mattress, making it reversible. What does this mean? To promote mattress longevity and extended support, you simply can periodically rotate the mattress to even out the wear on both sides. So, what exactly is it made of? First, it had 7 inches of independently encased pocket springs that help provide equal weight distribution by isolating a partner's movement. Additionally, the responsive coils also provide dynamic pressure point relief by offering balanced support, no matter the sleeping style. Second, the Tranquil features dual layers of high-density thermobonded polyester pads that help offer durability, as well as long-lasting support. What's more, the pads do not retain heat and allow airflow, thereby providing a cooler sleep than traditional mattresses. Finally, the layers are wrapped in a quilted polyester cover that exudes a ''cushion-like'' feel. Pads are made from 50% recycled polyester fibers and mattress contains no added fire retardant chemicals. GreenGuard Gold Certified to meet strict indoor air quality standards.