Worst mattress ever
The comments are true it sags and you sleep in a hole that you try and crawl out of. There is a ridge around the outside that makes you fall back in the center and you also lose space making the surface smaller than it should be. The worst mattress I ever had. I wake with back pain everyday. My old mattress I had for 10 years and it is better than this one. So sorry I made the purchase.
Osburncm
USA