Abstract We consider generic freeze-in processes for generation of Dark Matter, together kotha model dress with the consequent re-thermalization of the Standard Model fluid.We find that Dark Matter inherits the Standard Model adiabatic inhomogeneities on the cosmological scales 15-eg1053cl probed by current observations, that were super-horizon during freeze-in.Thereby, freeze-in satisfies the bounds on iso-curvature perturbations.