Here's why:

* Electronegativity: Polar bonds form when there's a significant difference in electronegativity between the two atoms involved. Electronegativity is the ability of an atom to attract electrons in a bond.

* Carbon and Hydrogen: Carbon and hydrogen have very similar electronegativity values. This means they share the electrons in the C-H bonds fairly equally.

* Symmetry: Methane is a tetrahedral molecule. The four C-H bonds are arranged symmetrically around the central carbon atom. This symmetry further ensures that there is no net dipole moment.

In summary: The lack of a significant electronegativity difference between carbon and hydrogen, combined with the symmetrical structure of methane, results in non-polar C-H bonds and a non-polar molecule overall.