The firmness options offered in the Yume (Dream Collection) mattresses (Kiwami 3.0, Takumi 2.0, and Nagomi 1.0) vary depending on the specific model: Kiwami 3.0 (Most Customizable & Supportive): This model offers the greatest degree of firmness customization. It features a multi-layered, 6-block Airfiber configuration on each side. These blocks can be individually adjusted to achieve your desired firmness level, ranging from soft to firm. Takumi 2.0 (Adjustable Firmness): This model provides a good balance between customization and convenience. It uses DUALMODE Airfiber blocks, each with two firmness options. You can simply flip the blocks to choose between a medium firm, firm, or extra firm feel on each side of the mattress. Nagomi 1.0 (Basic Support): This model offers the least customization in terms of firmness. It has a single layer of Airfiber blocks, resulting in a consistent firm and supportive feel.