One side soft for taking a nap after the lunch, the other side orthopaedic for healthy back. Decide by yourself how you want to sleep tonight and opt for the side which best suits your needs. You can turn it over any time, even during the night. Mattresses are anti-allergic. They are produced in different sizes so that they perfectly fit bed frames of all our beds. Overlays can be easily washed together with bed linen.