The mattress for relieving pressure ulcers includes a first sponge layer, an air mattress layer over the first sponge layer, an intermediate layer over the air mattress layer, a second sponge layer over the intermediate layer, and a paper sheet layer over the second sponge layer. The sponge layer and the air mattress layer are configured to increase the contact area of the patient's body with the bed, according to a patient's weight. The intermediate layer is a rubber layer configured to provide ventilation for areas of the mattress that contact a patient's body using dry air or dry air mixed with ozone gas, essential/volatile oil, and/or antibacterial vapors. The second sponge layer is designed to distribute the air under the patient's body. The paper sheet layer is configured to provide alarms in the event the mattress gets wet due to sweating or incontinence.