Cooling Scarf/Cooling Headband - Reusable - Stays Cool for Hours - Cooling Bandana for Men & Women - Unisex Advanced Crystal Polymer Cooling Technology. Non Toxic Cooling Scarf Super easy to use, simply soak in water for 3 minutes until the crystal beads have fully absorbed the water Perfect for keeping cool while on the move. The cooling scarf can also be used as a cooling headband For an even cooler feel, place in the freezer for 10 minutes after hydration, the cooling effect lasts hours Can also be used to keep your pets cool! For small to medium sized dogs/cats.