This cooling tie is made of eco-friendly cotton, is non-toxic, and can be reused repeatedly. It's easy to use, simply soak in water for minutes until the crystal beads have fully absorbed the water. You can wrap it around the neck, head or wrist to keep cool in the hot days. It's good for keeping cool while on the move, also can be used as a cooling headband. Suitable for work, use in hospitals, school, first aid kits, and sports in the summer. Multiple colors for you to choose.