a vehicle seat includes a head restraint which limits the magnitude of neck deflection of a vehicle occupant during a rear impact collision . the head restraint includes a support member attached to the top of a head restraint post . the support member includes a convex surface shaped to substantially conform to the profile of an occupant &# 39 ; s head and neck . the support member is covered by a resilient material such as foam . the foam thickness is reduced due to the presence of the support member . reduced foam thickness in addition to the shape of the support member provides for reduced occupant neck deflection during a rear impact collision .