  We use high-resolution angle resolved photoemission spectroscopy (ARPES) and
density functional theory (DFT) to investigate the electronic structure of the
charge density wave (CDW) system LaSb$_2$. This compound is among an
interesting group of materials that manifests both a CDW transition and lower
temperature superconductivity. We find the DFT calculations to be in good
agreement with our ARPES data. The Fermi surface of LaSb$_2$ consists of two
small hole pockets close to $\Gamma$ and four larger pockets near the Brillouin
zone (BZ) boundary. The overall features of the Fermi surface do not vary with
temperature. A saddle point is present at -0.19 $eV$ below the Fermi level at
$\Gamma$. Critical points in band structure have more pronounced effects on a
materials properties when they are located closer to the Fermi level, making
doped LaSb$_2$ compounds a potential interesting subject of future research.
Multiple peaks are present in the generalized, electronic susceptibility
calculations indicating the presence of possible nesting vectors. We were not
able to detect any signatures of the CDW transition at 355 K, pointing to the
subtle nature of this transition. This is unusual, given that such a high
transition temperature is expected to be associated with the presence of a
large CDW gap. This is confirmed through investigation of the Fermi surface and
through analysis of momentum distribution curves (MDC). It is possible that
changes are subtle and occur below current sensitivity of our measurements.
