  In this contribution we present an overview of recent results concerning the
impact of a possible flavour dependence of the intrinsic quark transverse
momentum on electroweak observables. In particular, we focus on the $q_T$
spectrum of electroweak gauge bosons produced in proton-proton collisions at
the LHC and on the direct determination of the $W$ boson mass. We show that
these effects are comparable in size to other non-perturbative effects commonly
included in phenomenological analyses, and should thus be included in precise
theoretical predictions for present and future hadron colliders.
