The N-RIT Cool Scarf is activated when it gets wet. It is enough to dip it into the cold water, and after a few seconds it will dry out. But because of the water, crystalline polymers will be activated, which will cool the body for several hours. The strip is ideal for sports, hiking, excursions to hot countries and recreation in nature. Characteristics: Long lasting cooling effect For the best effect, it can be placed not in water, but in the refrigerator Can be used up to 30 times Material:100% cotton Filler: high-tech polymer One size Weight:24grams