Abstract: An apparatus for cooling a portion of the anatomy of a wearer comprises an elongated fabric with fastening means on its ends for adjustably connecting the ends together in the form of a closed loop to encircle tightly a portion of the anatomy of the wearer such as the head or wrist. A portion of elongated fabric is provided with a pocket with a flap for folding over an elongated cooling pack. A cooling pack is inserted in the pocket and retained in the pocket by the flap. The cooling pack is comprised of a plurality of elongated tubes, at least some of the tubes containing ammonium nitrate and a container for water. A burstable seal is provided between the container for the water and the tubes containing the ammonium nitrate. Pressure may be applied to burst the seals allowing the water to mix with the ammonium nitrate and cause an endothermic cooling reaction.