Extra ExtendedCool Cooling Packs Number of Packs:4 so your clothing

so your clothing

1 UnderCool 3 cooling garment in your selected size and color

Perfect for heavy gear

or adding a second color to your rotation

Check your cooling packs when they are fully melted (after use

Extra ExtendedCool Cooling Packs Number of Packs:4 so your clothingRefresh 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