The introductions bring Vivon’s flat mattress collection to nine. Both new beds feature proprietary Sterling memory foam, which incorporates green tea and active charcoal over high-density foam cores. Suggested retail prices for the 8-inch and 10-inch mattresses with foundation are $599 to $799 in queen sizes. Beds ship from Vivon’s U.S. warehouses or are available by container from the company’s factory in China.