The 6 inch profile trundle mattress has Memory Foam and is designed for the ultimate in comfort and support starting with a top layer of breathable memory foam that works with a support layer providing you with the ultimate sleeping experience. Covered with a beautifully detailed knit cover for breathability, this elegant cover moves with you. The 4 way stretch conforms to your body for comfort working with the top layer of memory foam to optimize its contouring properties. In addition, the tailored knit fabric promotes airflow for a cooler night’s sleep. Memory foam slowly and automatically adjusts to your body weight and temperature. Memory foam offers complete, luxurious and stress free support. This can allow the spine to stay in a neutral position. When you do move in bed, memory foam gently "fills in" and reshapes itself to your new sleeping posture, cradling every part of your body.