Body Cooler / Body Warmer products are are non-toxic, re-useable and do not require refrigeration. Body Cooler® products are water activated and last up to 3 to 5 days then need re-activated. All Body Cooler / Body Warmer products are made of the highest quality materials and craftsmanship in the USA. Cooling vests and other cooling products by Body Cooler are designed to safely and inexpensively keep you and your pets cool when heat is a problem. We have Body Cooler products for many different applications. Those with ailments that cause heat discomfort, such as multiple sclerosis, will receive cooling comfort. We use passive cooling that requires water activation. We also carry some phase change items (using ice pack inserts) and will be adding more soon.