Sans Mateo is a sans serif font originally started out as a stripped down version of Bainsley but simplified and completely redrawn. It also has little different look from other fonts with its few curves to the ends of the stems and limbs.
The font has more than 16 thousand kerning pairs and supports fractions, superscript and subscript. As you might have guessed from the fact that this was built as a testbed font for new ideas with open type it has a lot of open type features. Stylistic set 01 turns the single storey 'g' into a two storey 'g', Stylistic Set 02 is only available in Dutch and cancels the localisation of IJ ligatures, if anyone wants to do this.
The default is tabular numbers but this can be swapped for proportional numbers using the 'pnum' function.