Whats the name of the mattress ?

Question

that you can change the firmness

Answer 1

Sleep Number.  However, it's just a glorified air mattress that adds or removes air.

Answer 2

temper matress?

Answer 3

Sleep Number Bed...but they absolutely suck. I've tried them and I was not impressed.

I'd buy a memory foam mattress if I were you....much cheaper and far better.