Huachnet Cooling Sports Scarf Neck Wrap Headband Ice Scarf Reusable Ice Bandana wristband Product Style: Nice Useful Sports Ice Scarf Headband Wristband; cooling tool for backpacking, traveling, hiking, exercising, gardening, first aid, or anywhere you need to cool down Crystal Polymer Cooling Technology Adopted; Firstly use, you should soak the scarf in water for 10 minutes, let the scarf absorb the water slowly until its physical swelling Secondly, you should take the scarf from the water,dry the surface water and you could wear it on neck, head , wrist or anywhere you need a cooling sensation This scarf is reusable, it will recover to original state after using 48 hours, airing it to store When you secondly use it, just soak in cold water for 3 minutes until crystals fully absorb the water