Roboto Flex is a modern, variable typeface that allows customisation up to 12 different axes. It allows us to tweak the font not only from the usual font weight and slant parameters, but also the width of the font, ascenders and descenders height and many more. One option that really stood out is the ability to support optical size in CSS, where the display of the font will be optimised automatically for best reading experience according to the font size.
Roboto Flex sets a new standard in the modern web typography. It allows designers and developers to create a new kind of typographic system that is optimised for the best user experience, while giving the maximum flexibility of the font.