  The properties of kagome metals are governed by the interdependence of band
topology and electronic correlations resulting in remarkably rich phase
diagrams. Here, we study the temperature evolution of the bulk electronic
structure of the antiferromagnetic kagome metal FeGe using infrared
spectroscopy. We uncover drastic changes in the low-energy interband absorption
at the 100 K structural phase transition that has been linked to a
charge-density-wave (CDW) instability. We explain this effect by the minuscule
Fe displacement in the kagome plane, which results in parallel bands in the
vicinity of the Fermi level. In contrast to conventional CDW materials,
however, the spectral weight shifts to low energies, ruling out the opening of
a CDW gap in FeGe.
