extrafirm
Extrafirm is a marketing term used to describe a level of firmness that is higher than firm on products, most commonly in mattresses and related comfort items. It is a qualitative label rather than a standardized measurement, and its exact feel can vary between manufacturers.
In mattresses, extrafirm usually implies a very high level of support with minimal cushioning, often achieved
Because there is no universal standard for extrafirm, consumers are advised to test products or review product
Other industries may also use extrafirm to indicate stiffness in cushions, sports equipment padding, or footwear