Slacker is equipped with Standard Ligatures and Contextual Alternates - they help to keep the flow lively and balanced and connections smooth so you should normally keep the features on. In addition Slacker has Stylistic, Swash and Titling Alternates for more showy letterforms. If you want to keep letters connecting to one another at maximum try turning on Stylistic Set 01 (SS01). On top of these Slacker has even more alternates in the Character Window making the total glyph count to 660.