Hi niraj1985,
There is more information about the materials in the Tuft & Needle mattress in post #2 here in the simplified choice mattress topic and in posts #2 and #6 here.
It’s a more resilient material than memory foam (which has little to no resilience or “bounce” at all).
I would also keep in mind that the resilience of a material has little to do with how “supportive” a mattress will be or how how well a mattress will “match” your specific needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and your Personal preferences) or it’s firmness and is more connected to the “feel” of a mattress.
There are no “standard” definitions or consensus of opinions for firmness ratings and different manufacturers can rate their mattresses very differently than others so a mattress that one manufacturer rates as being a specific firmness could be rated very differently by another manufacturer.
Different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that feels firm for one person can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here) so different people can have very different opinions on how two mattresses compare in terms of firmness and some people may rate one mattress as being firmer than another and someone else may rate them the other way around. This is all relative and very subjective and is as much an art as a science.
When you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc) and whether a specific mattress may be a good “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Like the other simplified choice mattresses they have a great trial period so you can test them in your bedroom instead of a showroom with little risk outside of the time you spend trying it (or returning/donating it if it doesn’t work out as well as you hoped) but the “bottom line” is that the only way to know how firm a mattress feels for you (regardless of how firm it may feel for anyone else) or whether it is “firm enough” or “supportive enough” for you will be based on your own personal experience.
Phoenix