I largely credit that to the materials it uses; mainly the foam. 3Z is unique in that not many mattress brands in the US pour their own foam or, let alone, own a factory that makes its beds in-house.
Since this is more of a premium all-foam mattress, it's priced a bit higher than your standard foam bed. Luckily, Nolah as a brand is quite good at offering heavy discounts on their beds ...