Kishigo Brisk Cooling Series® Shoulder Insert Brisk Cooling Promotes comfort and endures safety in high heat conditions.Provides extended cooling comfort and heat stress preventionBrisk Cooling is lightweight, durable and reusableActivated by simply submerging in waterCooling lasts for 5-10 hours & can be re-activated by re-submerging in waterSimple and easy to useOne size fits mostEVAPORATIVE COOLING TECHNOLOGYSpecialized fabrics and fibers create an advanced water management system, called 'HyperKewl'.HyperKewl absorbs, stores and releases water within the multi-layered structure.The fabrics cool itself through evaporation and a chill effect is created.Users can expect the evaporative cooling fabric to provide temperatures that are up to 15-20degree cooler than the ambient tempera...