  We discuss the finite-temperature effective potential of the Standard Model,
$\veff$, with emphasis on the resummation of the most important infrared
contributions. We compute the one-loop scalar and vector boson self-energies in
the zero-momentum limit. By solving the corresponding set of gap equations,
with the inclusion of subleading contributions, we find a non-vanishing
magnetic mass for the $SU(2)$ gauge bosons. We comment on its possible
implications for the nature of the electroweak phase transition. We also
discuss the range of validity of our approximations and compare this with other
approaches.
