  We discuss differences between the IP-Glasma model and typical
wounded-nucleon model like initial conditions. We point out that the IP-Glasma
initial state is more compact in the transverse plane and produces a
significant initial flow, both of which contribute to an increased radial flow
in the subsequent hydrodynamic evolution. A larger bulk viscosity, compared to
calculations that use other initial state models, is required to compensate for
these effects and find agreement with experimental data. We further demonstrate
the importance of the initial momentum anisotropy of the glasma for anisotropy
measures in small collision systems such as p+Pb.
