Aqua Cool helps prevent heat stress when you're outside on those hot days. It looks like a regular bandana, but inside there is enough super-absorbent, lightweight & non-harmful chemical material to hold 12 oz of cooling water. It takes about twelve hours for the water to evaporate, and as it does it cools your neck and body. All you need is water - and in 3-5 minutes you're ready for any outdoor activity. It's great for jogging, golf, tennis, yard work, construction... anytime you're hot!