The Gel Visco IV, all foam mattress, is a very good value for a Gel Memory Foam Mattress. Atop an all foam core you get both a layer of Visco-Elastic Memory Foam and Cool Gel Visco, for cooler feeling, supportive and pressure relieving mattress. With Memory Foam you get no motion transfer, meaning you will stay sleeping when your partner gets up in the middle of the night. A good mattress for a back or side sleeper.