• 23cm +/- 1cm• Medium/Hard• Celsion Talalay Latex• Natural Talalay Latex The coolest mattress you've ever slept on in your life is made from 100% natural Talalay Latex! The Celsion mattress consists of a layer of 100% natural hard Talalay Latex, combined with the thermal regulating material Celsion Talalay Latex. Celsion Talalay Latex on the upper surface of the mattress minimizes pressure, offering ideal support even in the most sensitive areas, such as the waist and neck. With the thermoregulatory properties of Celsion Talalay Latex, body temperature is kept constant throughout sleep.