Very comfortable. Firm but not hard. I don't know about how they are made now but when we bought our first one (Serta Perfect Sleeper Queen) which was about 45 years ago-well we still have it. They hold their shape and last forever. We bought a king size one about 27 years ago. It has just begun to sag in places and no longer looks flat and level so that is why we got a new one. The old one is still comfortable and is on a bed in our basement. Great product.