The Rockshox Judy Air is a great upgrade fork if you want to get rid of the old Suntour coil spring fork that came on your bike. With an air fork you shed usually almost 2 lbs of weight off the front end and greatly improve the feel and adjustability of your fork.
The Judy has an air port to increase or decrease the air pressure depending on your weight and preference. It also has compression control and rebound control to fine tune how you want it to perform.
Specs: Straight steerer tube (not tapered), Quick Release 100mm (so not boost). In 29” wheel option they currently only have 100mm travel options for the Judy.