Ice water from the drink cooler or a cold river for 20 minutes should do the trick. …just don’t lose them in the river. Tip: Use a net laundry bag to place the packs in the river.

Questions about our vests or shipping? Reach out to the ThermApparel team toll-free at 855-232-7233, write to us through our website’s contact form or chat with us via live chat. We always respond because, otherwise, that wouldn't be cool.