Enjoy restful and restorative sleep with the Night Therapy 13.5" Euro Boxtop Spring Mattress by Zinus. This Night Therapy Mattress is made with the latest evolution of memory foam, Biofoam, which replaces some of the traditional petroleum with plant oil. The mattress also includes green tea extract and all-natural active charcoal to help absorb moisture, eliminate odors and keep your mattress fresh. The mattress is treated with ADAPTIVE technology that dynamically responds to environmental changes like temperature and humidity. The ADAPTIVE fabric re-uses the energy (heat) of your body to boost moisture evaporation, keeping your mattress cool and dry all night.