Hi sAfuRos,
Welcome … and I’m glad you found us 
There is more about Tuft & Needle and many of the other “simplified choice” mattresses in post #2 here in the simplified choice mattress topic and there is more about the foam they are using in posts #2 and #6 here. The comfort layers are a high performance polyfoam and their support core is conventional polyfoam.
If you are looking at online options then outside of the simplified choice list the mattress shopping tutorial also includes several links to lists of many of the better online options I’m aware of (in the optional online step) that include many different types and categories of mattresses in a wide range of budgets and firmness levels that would also be well worth considering.
If you let me know your city or zip code I’d be happy to let you know about any of the better options or possibilities I’m aware of in your area as well.
Phoenix