The package supports a number of features of the Latin Modern fonts which are not easily accessible via the default (La)TeX support. In particular, the package supports the use of the various styles of digits available, small-caps and upright italic shapes, and alternative weights and widths. It also supports variable width typewriter and the quotation font.

By default, the package uses proportional oldstyle digits and variable width typewriter but this can be changed by passing appropriate options to the package. The package also supports using (for example) different styles of digits within a document so it is possible to use proportional oldstyle digits by default, say, but tabular lining digits within a particular table.