This Gel Infused Memory Foam Mattress is constructed of all foam, with Ventilated Gel Infused Memory Foam with Phase Change Material as the top layer, providing a cooling, pressure relieving feel. Additional Luxury Comfort Foam and Gel Infused Memory Foam make this a plush and supportive mattress. The foam core is encases with higher density foam providing a firmer edge. This mattress is good for a side or back sleeper.