A wearable cold pack formed with a reservoir for retention of liquid, and a cooling agent composition including salt mixed with water in the reservoir. The salt having a capacity to provide an endothermic effect to enhance cooling when mixed with water. The salt material is primarily ammonium nitrate that has been stabilized against detonation by the addition of an effective amount of phosphate material. The wearable cold pack may be configured as a joint wrap, a head wrap, a neck wrap, a shoulder wrap, a helmet or many other articles. The wearable cold pack cooling agent composition is capable of cooling in the amount of at least 130 Btu/lb due to endothermic effect when mixed with water.