The Elixir Sports Cooling Hankerchief Bandana Cool Scarf Neck Wrap for Running Fishing Hiking Riding Crystal Polymer Cooling Technology: The beads will absorb the water and expand. Scarf will be ICY COOL after the beads are filled with water Super easy to use: Just soak in cold water for 3 minutes until crystals fully absorb the water Gently remove excess water then tie around your neck, wrist, or head Colorfast, Non-Toxic, Environmentally Friendly Cotton Size: 35" inches long by 2" inces wide