Extra ExtendedCool Cooling Packs Number of Packs:4 After your order is processed

After your order is processed

or adding a second color to your rotation

with adjustable straps for a flexible

UltraCool is our most powerful vest

flexible cooling placement

Extra ExtendedCool Cooling Packs Number of Packs:4 After your order is processedRefresh your ThermApparel UnderCool 3, RallyWrap, and UltraCool cooling vests with a new set of long lasting ExtendedCool cooling packs. ExtendedCool cooling packs freeze and melt at 70F (21C) to deliver strong, comfortable cooling. Think of it like a heat exchanger: the packs pull heat out of the blood flowing through vessels near your skin, and your body circulates that cooled blood back through your entire system, bringing your core temperature