What a true gem this mattress has come to be! I'm a good-sized fella & I've been through my share of beds in my lifetime. I am convinced that there does not exist a coil-spring mattress, or hybrid, that can hold a candle to this mattress. This thing is firm, but doesn't require any box-springs or platform. Soft and supportive on top, allowing you to achieve maximum comfort while sleeping. This mattress stays cool, too, unlike some other brands & designs.