> The main size of a [fully inflexible](https://www.w3.org/TR/css-flexbox-1/#fully-inflexible) item with a [definite](https://www.w3.org/TR/css-flexbox-1/#definite) [flex basis](https://www.w3.org/TR/css-flexbox-1/#flex-flex-basis) is, by definition, [definite](https://www.w3.org/TR/css-flexbox-1/#definite). This is not helpful.