FeGe, an antiferromagnetic kagome metal, exhibits a unique low-temperature phase characterized by a structural transition at 100 K, linked to a charge-density-wave (CDW) instability. Infrared spectroscopy reveals changes in low-energy interband absorption, which are explained by minimal Fe displacement in the kagome plane, leading to parallel bands near the Fermi level. Unlike conventional CDW materials, no gap opening is observed in FeGe, as spectral weight shifts to lower energies. The kagome lattice, known for its complex electronic properties, supports various quantum phenomena, including flat-band ferromagnetism and unconventional superconductivity. FeGe's structure features magnetic Fe-kagome planes stabilized by Ge atoms, with an antiferromagnetic arrangement at room temperature. Below 100 K, a canted AFM arrangement is observed, and a low-temperature anomaly is detected in magnetic susceptibility. However, no corresponding change is seen in electric resistivity. Neutron diffraction and STM suggest a short-range CDW phase with minor lattice distortion. Fourier-transform infrared spectroscopy indicates no gap opening below 100 K, contradicting the CDW scenario. DFT calculations show that the structural transition at 100 K leads to new interband optical transitions at low energies, interpreted as band splitting rather than gap opening. The low-temperature phase of FeGe is distinct from other kagome metals, with significant electronic correlations and structural instabilities. The study highlights the role of Ge dimerization in the low-temperature phase, affecting the band structure and optical properties. The findings suggest that FeGe's low-temperature phase is governed by complex interactions between magnetism, electronic correlations, and structural changes, offering new insights into the rich phase diagram of kagome metals.FeGe, an antiferromagnetic kagome metal, exhibits a unique low-temperature phase characterized by a structural transition at 100 K, linked to a charge-density-wave (CDW) instability. Infrared spectroscopy reveals changes in low-energy interband absorption, which are explained by minimal Fe displacement in the kagome plane, leading to parallel bands near the Fermi level. Unlike conventional CDW materials, no gap opening is observed in FeGe, as spectral weight shifts to lower energies. The kagome lattice, known for its complex electronic properties, supports various quantum phenomena, including flat-band ferromagnetism and unconventional superconductivity. FeGe's structure features magnetic Fe-kagome planes stabilized by Ge atoms, with an antiferromagnetic arrangement at room temperature. Below 100 K, a canted AFM arrangement is observed, and a low-temperature anomaly is detected in magnetic susceptibility. However, no corresponding change is seen in electric resistivity. Neutron diffraction and STM suggest a short-range CDW phase with minor lattice distortion. Fourier-transform infrared spectroscopy indicates no gap opening below 100 K, contradicting the CDW scenario. DFT calculations show that the structural transition at 100 K leads to new interband optical transitions at low energies, interpreted as band splitting rather than gap opening. The low-temperature phase of FeGe is distinct from other kagome metals, with significant electronic correlations and structural instabilities. The study highlights the role of Ge dimerization in the low-temperature phase, affecting the band structure and optical properties. The findings suggest that FeGe's low-temperature phase is governed by complex interactions between magnetism, electronic correlations, and structural changes, offering new insights into the rich phase diagram of kagome metals.