Assuming you are referring to leather boots: typically you'll need
- Dauber / Applicator Brush
- Buffing / Polishing Brush
The names of the two brushes are fairly self explanatory: the dauber
is usually smaller, with less bristles, so that it can reach the
cracks and seams within the leather. Once the dauber has applied
the polish to the boot, and the polish has been left to dry, the
buffer brush removes the dried polish and shines the leather.