Ltpgtthis mattress has one side for summer and another one for winter the summer side is made of intelligent memory foam layer and a super soft gel with 3cm of thickness with which you will get a total adaptation for your body in the hottest summer nights the winter side is made of 3cm of memory foam which assures a good restltpgt ltpgtits 2 sides will allow you to adapt the mattress to the season of the year you will feel an improvement in your back and also a favourable eff