Part of the Stu font family, Stu Mid keeps all lowercases tucked within the x-height space. The character glyphs can be used interchangeably between the various Stu styles to achieve a more "bouncy" typesetting effect.

Stu pays homage to oldstyle numerals, where type designers vary the heights of numbers to resemble a line of running lowercase text. It seeks to address the question: "What if every lowercase alphabet also had varying heights?" The result is a font family with full-fledged ascenders ('Hi'), strictly x-heights ('Mid'), and only descenders ('Lo').

You can view the documentation of the Stu font family design here.