I did not like why the spring mattress was delivered collapsed?Then, after the first night, a dent formed in the middle of the mattress and did not straighten out.It seems that I slept on it for at least six months.Although he was given a 5-year guarantee.Now I regret that I did not listen to my friends who told me that there is no such thing for orthopedic mattresses.I want to return this mattress back and get my money back.I'll look in the store to see what I'm buying.