The "Calm" Memory Foam Mattress is an all foam mattress which ships in a box for easy delivery and placement up tight stairways and through sharp turn hallways. A green tea infused polyurethane base foam supports 2 layers of CoolGel Infused Bamboo Charcoal Infused Memory Foam, for a supportive, pressure relieving luxury Firm feel. Ideal for a back or stomach sleeper.