I don’t know what type of material is in the cushion, but it is extremely firm. Maybe too firm for some. Works for a nap, but not comfortable for a night’s sleep, in my opinion. I bought this to be able to fit next to my husband’s hospital bed, when he was recovering from heart surgery, and i had to buy a memory foam mattress to put on top of it, AND i added 2 folded quilts to that, in order to make it tolerable for sleep.