head curtains for dock shelters or dock seals are disclosed . an example dock apparatus disclosed herein includes a first weather barrier and a second weather barrier . the first and second weather barriers are positioned laterally of a doorway of a loading dock and compressible by a vehicle . the lateral weather barriers include inner surfaces that are to bulge toward each other in response to the vehicle compressing the lateral weather barriers . a head curtain is at least partially positioned between the lateral weather barriers and being engagable by the vehicle , the head curtain having a lateral stiffness such that in response to the vehicle engaging the head curtain and compressing the lateral weather barriers , the head curtain becomes pinched between the bulging inner surfaces to restrict a vertical movement of the curtain .