OSO Mattress - Queen ORGANIC LATEX  Made from CertiPUR-US certified organic latex foam, the OSO mattress offers the perfect support where you need it most. TWO COMFORT OPTIONS  The OSO has two comfort options in each mattress. With a firm end and soft end, you are able to switch between these by rotating the bed 180 degrees. BREATHABLE  Natural latex foam allows air to flow freely through the bed, keeping you cool at night. DURABLE  Every OSO mattress is made from highly durable materials which has passed the strenuous Intertek certification process. CONVENIENCE  Can sit directly on floor or any slatted bed base. No box spring needed.