  Soft hairs are intrinsically infrared features of a black hole, which may
also affect near-horizon physics. In this work, we study one of the primary
observables through which we can study the effects of a particular type of soft
hair in Einstein's gravity: the shadow of a non-rotating black hole implanted
with linear {\it regular} superrotational hair. We show that such soft hairs
deform the shadow from the characteristic circular shape of bald Schwarzschild
black holes into ellipses. Such a unique effect can be observed in future black
hole imaging projects. This starkly contrasts with the supertranslated
counterpart, for which the only changes are the static shift of the circular
shadow's position and thus cannot be detectable. Our results demonstrate the
richness of observable effects due to the infrared structures of Einstein's
gravity.
