Hi magisimo.
Welcome to the Mattress Forum!
I hope that you’ll be able to use the information here on the forum to assist you in your mattress shopping experience, and I’d suggest to start by reading the mattress shopping tutorial here, which provides guidance in logical steps on how to find mattresses using good quality materials, and to help differentiate from those that don’t.
I’ll be interested in learning about any decisions you may make, or of course any questions that you may have.
Phoenix