This memory form is what I would call medium firmness. I bought it in twin size for a wooden framed trundle bed. It's very firm, yet as you sit on it, it slowly caves slightly to your body's shape. Not too soft, if anything, slightly on the firm side of medium. Which I would prefer. It was placed on the twin sized wooden frame WITHOUT using any box spring. I'm glad it's 10-11 inches thick and holds its own shape well without a box spring. All bedding and sheets fit perfectly. Great for kids beds, a guest bed. I'm hoping it'll accommodate adult guest who prefer a bed not too firm and not too soft. Seems to be a perfect blend.