Physical activity raises your body temperature and can cause you to overheat, which can be detrimental when engaged in physical activities such as cycling or running. But strapping on a Sports Cool Vest will provide cooling comfort from the start to the finish line. And even if you don't wear it during physical activity, doing so afterward can speed the cool down process by restoring your core temperature. The Sports Cool Vest is outfitted with a heavy duty front zipper, dual side elastic straps and over-the-shoulder adjustability for maximum hold that will fit a wide range of body sizes. And since it's bound to get sweaty and dirty, it can also be conveniently cleaned in the laundry along with your regular clothing. Features: Includes one set of eight high-performance cooling packs (four large, four small) Vest features adjustable dual side straps Weighs less than 5 pounds with cooling packs Dry and clean, not soggy and soaking wet like evaporative products Maintains a dry, comfortable 59°F / 15°C for up to 2.5 hours in 100°F / 38°C heat Self-contained, portable and unpowered - no cumbersome hoses, tubes or tethers Made in the USA Glacier Tek Sports Cool Vest with Nontoxic Cooling Packs