Kafka Kool Ties Original Cooling Bandana-Patterns The Original Cooling Bandana-Do not accept imitations Soak tie in water for 1 hour and the crystals hydrate. Then simply wrap around your neck and feel the evaporative cooling action--works from hours to several days No refrigeration ever needed Great for many outdoor activities, the Kafka Kool Tie is soft, comfortable and easy to wear Made in the USA-Lifetime Warranty