Three monosulphur fluorides are known  ${\mathrm{SF}}_2, {\mathrm{SF}}_4$ and ${\mathrm{SF}}_6$. Of these, polar species include 

The S-F bonds in both $S{F}_2$ and $S{F}_4$ are polar, and both molecules are generally polar.

The $S{F}_4$ molecule contains one lone pair on S and four S-F bond pairs. Since the molecule has well defined charged poles due to its asymmetric seesaw form, $S{F}_4$ is polar (µ=0.632 D).