Because spring mattresses make a " HOLD " in the middle of the mattress in two years or so. Cost two or three times more than foam mattress and " THEY ARE NOT COMFORTABLE AS FOAM MATTRESS ".
I was so impressed with this mattress. I purchased a twin size for our daybed. My best friend stayed with us while in town last week and she said it was very comfortable.
I love our new bed! Our old bed was well past it's expiration. I woke up with back and other pains every morning. Now those are remarkably better and I've slept well every night since our first night on this mattress. Love the comfort and the price can't be beat. We'll probably stock our little, old motel with these when next we change those mattresses.