SIMPLY GOOD SLEEP – Designed to make every night’s rest count, the ActivFresh(TM) mattress features the perfect balance of green tea memory foam atop Zinus Base Foam(TM) to help you sleep supported and undisturbed REVOLUTIONARY WONDERBOX PACKAGING – This mattress ships in a Zinus WONDERBOX designed 23% smaller than other mattresses in a box for easier maneuverability, less packaging waste, and reduced carbon footprint REFRESH AND UNWIND – Green tea infused into enveloping memory foam ensures long lasting freshness along with contouring softness CERTIPUR-US CERTIFIED – Highest quality foam is CertiPUR-US(R) certified for durability, performance, and content Worry-free 10 year limited warranty included; twin mattress supports a maximum weight of 250 lbs, while all other sizes can support up to 500 lbs