Apparatuses and methods for the cooling of the cranial and extracranial portions of a patient in need thereof. The apparatuses and methods of the present invention preferably employ a head cooling apparatus which includes a watertight shroud for the head and which needs no refrigeration. In certain preferred embodiments, the apparatuses of the present invention are collapsible and possess a reduced profile. In some presently preferred embodiments, the present invention includes a hammock that supports the head. In some embodiments, the present invention includes a shroud that lies behind the head with optional portions that may be drawn over the patient's neck and cranial area. The apparatuses and methods of the present invention also provide an improved mechanism for cooling the cranial and extracranial areas through the use of a novel distribution of endothermic solids (e.g. ammonium nitrate). The present invention provides a novel distribution of ammonium nitrate pellets that preferably includes multiple populations solid ammonium nitrate, preferably including small diameter (e.g., powdered) and larger diameter (e.g., 7 millimeter) ammonium nitrate to allow water initially to be cooled very quickly, thereby facilitating the rapid cooling of the cranial and extracranial areas, while at the same time producing extended hypothermia.