I used to wear out top mattresses in 3 years. I could feel the springs in my ribs. I bought a sleep number 18 years ago and it still feels great. My wife likes a pillow top, so she uses an insert and changes it every 4 to 5 years. It can be dismantled and laundered.
Any part of a sleep number can be individually replaced if needed. We just have not needed it.
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